build(deps): bump idna from 3.4 to 3.6

Bumps [idna](https://github.com/kjd/idna) from 3.4 to 3.6.
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.6)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/pinned.txt

@@ -2,7 +2,7 @@ certifi==2023.11.17        # via requests
 cffi==1.16.0              # via cryptography, pynacl
 charset-normalizer==3.3.2 # via requests
 cryptography==41.0.5      # via securesystemslib
-idna==3.4                 # via requests
+idna==3.6                 # via requests
 pycparser==2.21           # via cffi
 pynacl==1.5.0             # via securesystemslib
 requests==2.31.0