pip: bump xmlschema from 3.4.2 to 3.4.3

Bumps [xmlschema](https://github.com/sissaschool/xmlschema) from 3.4.2 to 3.4.3.
- [Release notes](https://github.com/sissaschool/xmlschema/releases)
- [Changelog](https://github.com/sissaschool/xmlschema/blob/master/CHANGELOG.rst)
- [Commits](sissaschool/xmlschema@v3.4.2...v3.4.3)

---
updated-dependencies:
- dependency-name: xmlschema
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pip-requirements.txt

@@ -15,7 +15,7 @@
 edk2-pytool-library==0.22.2
 edk2-pytool-extensions==0.28.0
 antlr4-python3-runtime==4.13.2
-xmlschema==3.4.2
+xmlschema==3.4.3
 regex==2024.9.11
 pywin32==308; sys_platform == 'win32'
 pygount==1.8.0