Bump pywin32 from 306 to 308

Bumps [pywin32](https://github.com/mhammond/pywin32) from 306 to 308.
- [Release notes](https://github.com/mhammond/pywin32/releases)
- [Changelog](https://github.com/mhammond/pywin32/blob/main/CHANGES.txt)
- [Commits](https://github.com/mhammond/pywin32/commits)

---
updated-dependencies:
- dependency-name: pywin32
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -2,7 +2,7 @@ aiohttp~=3.9b
 certifi>=2023.7.22
 cx_Freeze~=7.1; sys_platform == 'win32'
 setuptools~=75.3
-pywin32==306; sys_platform == 'win32'
+pywin32==308; sys_platform == 'win32'
 stlib~=2.1
 stlib-plugins~=1.2
 build~=1.0