ci: update griffe requirement from ~=1.4 to ~=1.5 in /.github/workflows

Updates the requirements on [griffe](https://github.com/mkdocstrings/griffe) to permit the latest version.
- [Release notes](https://github.com/mkdocstrings/griffe/releases)
- [Changelog](https://github.com/mkdocstrings/griffe/blob/main/CHANGELOG.md)
- [Commits](mkdocstrings/griffe@1.4.0...1.5.1)

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

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

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
-griffe~=1.4
+griffe~=1.5
 nox==2024.4.15
 pip==24.2
 pip-tools==7.4.1