pip: bump edk2-pytool-library from 0.21.4 to 0.21.5 (#897)

Bumps
[edk2-pytool-library](https://github.com/tianocore/edk2-pytool-library)
from 0.21.4 to 0.21.5.

[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=edk2-pytool-library&package-manager=pip&previous-version=0.21.4&new-version=0.21.5)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

You can trigger a rebase of this PR by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

Co-authored-by: Kun Qin <kuqin@microsoft.com>

pip-requirements.txt

@@ -12,7 +12,7 @@
 # https://www.python.org/dev/peps/pep-0440/#version-specifiers
 ##
 
-edk2-pytool-library==0.21.4
+edk2-pytool-library==0.21.5
 edk2-pytool-extensions==0.27.3
 xmlschema==3.2.0
 regex==2023.12.25