Bump regex dependency to 2021.4.4 to fix import of Pattern class

CHANGES.md

@@ -1,5 +1,11 @@
 # Change Log
 
+## Unreleased
+
+### _Black_
+
+- Bumped regex version minimum to 2021.4.4 to fix Pattern class usage (#2621)
+
 ## 21.11b0
 
 ### _Black_

Pipfile

@@ -42,7 +42,7 @@ platformdirs= ">=2"
 click = ">=8.0.0"
 mypy_extensions = ">=0.4.3"
 pathspec = ">=0.8.1"
-regex = ">=2020.1.8"
+regex = ">=2021.4.4"
 tomli = ">=0.2.6, <2.0.0"
 typed-ast = "==1.4.3"
 typing_extensions = {markers = "python_version < '3.10'", version = ">=3.10.0.0"}

setup.py

@@ -101,7 +101,7 @@ def find_python_files(base: Path) -> List[Path]:
         "platformdirs>=2",
         "tomli>=0.2.6,<2.0.0",
         "typed-ast>=1.4.2; python_version < '3.8' and implementation_name == 'cpython'",
-        "regex>=2020.1.8",
+        "regex>=2021.4.4",
         "pathspec>=0.9.0, <1",
         "dataclasses>=0.6; python_version < '3.7'",
         "typing_extensions>=3.10.0.0",