build: bump certifi from 2023.7.22 to 2024.7.4 in /.github/workflows

Bumps [certifi](https://github.com/certifi/python-certifi) from 2023.7.22 to 2024.7.4.
- [Commits](certifi/python-certifi@2023.07.22...2024.07.04)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
...

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

.github/workflows/mkdocs-requirements.txt

@@ -1,5 +1,5 @@
 babel==2.12.1
-certifi==2023.7.22
+certifi==2024.7.4
 charset-normalizer==2.1.1
 click==8.1.3
 colorama==0.4.6