Bump idna from 3.7 to 3.15 in /link-verifier

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]

link-verifier/requirements.txt

@@ -2,7 +2,7 @@ beautifulsoup4==4.9.3
 bs4==0.0.1
 certifi==2024.7.4
 chardet==3.0.4
-idna==3.7
+idna==3.15
 requests==2.33.0
 soupsieve==2.1
 termcolor==1.1.0