pip: update edk2-pytool-extensions requirement from ~=0.30.6 to ~=0.30.8 (#156)

Updates the requirements on
[edk2-pytool-extensions](https://github.com/tianocore/edk2-pytool-extensions)
to permit the latest version.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pip-requirements.txt

@@ -13,7 +13,7 @@
 ##
 
 edk2-pytool-library~=0.23.11
-edk2-pytool-extensions~=0.30.6
+edk2-pytool-extensions~=0.30.8
 antlr4-python3-runtime==4.13.2
 regex
 pygount==3.1.1