Update version numbers for TensorFlow 2.2.1

[tensorflow-jenkins]

Before merging this PR, please double check that it has correctly updated
core/public/version.h, tools/pip_package/setup.py, and
tensorflow/tensorflow.bzl. Also review the execution notes below:

Major: 2 -> 2
Minor: 2 -> 2
Patch: 0 -> 1

WARNING: Below are potentially instances of lingering old version string 
"2.2.0" in source directory "tensorflow/" that are not updated by this script. 
Please check them manually!
tensorflow/tools/pip_package/setup.py:64:2.2.0
tensorflow/tools/pip_package/setup.py:65:2.2.0
tensorflow/tools/pip_package/setup.py:95:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:78:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:127:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:161:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:188:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:191:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:222:2.2.0
tensorflow/lite/micro/tools/make/third_party_downloads.inc:26:2.2.0
tensorflow/lite/micro/tools/make/third_party_downloads.inc:28:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:275:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:276:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:282:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:295:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:331:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:167:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:168:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:174:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:187:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:223:2.2.0
tensorflow/lite/micro/examples/magic_wand/train/README.md:106:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:177:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:178:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:184:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:197:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:235:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:180:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:181:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:187:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:200:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:236:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:90:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:107:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:139:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:172:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:199:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:202:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:233:2.2.0

WARNING: Below are potentially instances of lingering old version string 
"2.2.0" in source directory "tensorflow/" that are not updated by this script. 
Please check them manually!
tensorflow/tools/pip_package/setup.py:64:2.2.0
tensorflow/tools/pip_package/setup.py:65:2.2.0
tensorflow/tools/pip_package/setup.py:95:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:78:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:127:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:161:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:188:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:191:2.2.0
tensorflow/lite/toco/tflite/op_version.cc:222:2.2.0
tensorflow/lite/micro/tools/make/third_party_downloads.inc:26:2.2.0
tensorflow/lite/micro/tools/make/third_party_downloads.inc:28:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:275:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:276:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:282:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:295:2.2.0
tensorflow/lite/micro/examples/person_detection/README.md:331:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:167:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:168:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:174:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:187:2.2.0
tensorflow/lite/micro/examples/hello_world/README.md:223:2.2.0
tensorflow/lite/micro/examples/magic_wand/train/README.md:106:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:177:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:178:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:184:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:197:2.2.0
tensorflow/lite/micro/examples/magic_wand/README.md:235:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:180:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:181:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:187:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:200:2.2.0
tensorflow/lite/micro/examples/micro_speech/README.md:236:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:90:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:107:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:139:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:172:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:199:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:202:2.2.0
tensorflow/lite/tools/versioning/runtime_version.cc:233:2.2.0