Bump idna from 3.7 to 3.15 in /tests/local

Bumps [idna](https://github.com/kjd/idna) from 3.7 to 3.15.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.7...v3.15)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.15'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

tests/local/requirements.txt

@@ -11,7 +11,7 @@ DateTime==4.3
 deepdiff==8.6.2
 f90nml==1.2
 gdown==5.2.2
-idna==3.7
+idna==3.15
 importlib-metadata==4.13.0
 locket==0.2.0
 more-itertools==7.2.0