PIP: Update pip requirement in /.github

Updates the requirements on [pip](https://github.com/pypa/pip) to permit the latest version.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@21.0...24.2)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/requirements.txt

@@ -1,4 +1,4 @@
-pip>=21.0,<24.2
+pip>=21.0,<24.3
 pre-commit>=3.7.1
 ruff==0.6.3
 esphome