pip: update edk2-pytool-extensions requirement from ~=0.17.2 to ~=0.20.0

Updates the requirements on [edk2-pytool-extensions](https://github.com/tianocore/edk2-pytool-extensions) to permit the latest version.
- [Release notes](https://github.com/tianocore/edk2-pytool-extensions/releases)
- [Commits](tianocore/edk2-pytool-extensions@v0.17.2...v0.20.0)

---
updated-dependencies:
- dependency-name: edk2-pytool-extensions
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pip-requirements.txt

@@ -13,7 +13,7 @@
 ##
 
 edk2-pytool-library~=0.11.6
-edk2-pytool-extensions~=0.17.2
+edk2-pytool-extensions~=0.20.0
 edk2-basetools==0.1.29
 antlr4-python3-runtime==4.11.1
 regex==2022.8.17