Bump idna from 3.11 to 3.15

Bumps [idna](https://github.com/kjd/idna) from 3.11 to 3.15.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.11...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]

requirements.txt

@@ -17,7 +17,7 @@ googleapis-common-protos==1.72.0
 grpcio==1.78.0
 html5lib==1.1
 html_text==0.7.1
-idna==3.11
+idna==3.15
 importlib_metadata==8.7.1
 isodate==0.7.2
 jstyleson==0.0.2