Bump idna from 3.13 to 3.15

Bumps [idna](https://github.com/kjd/idna) from 3.13 to 3.15.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.13...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-3.13.txt

@@ -22,7 +22,7 @@ Flask==3.1.3
 greenlet==3.5.0
 humanize==4.15.0
 hyperlink==21.0.0
-idna==3.13
+idna==3.15
 Incremental==24.11.0
 itsdangerous==2.2.0
 Jinja2==3.1.6