Bump pwned-passwords-django from 2.1 to 5.1.0 in /requirements

Bumps [pwned-passwords-django](https://github.com/ubernostrum/pwned-passwords-django) from 2.1 to 5.1.0.
- [Changelog](https://github.com/ubernostrum/pwned-passwords-django/blob/trunk/docs/changelog.rst)
- [Commits](ubernostrum/pwned-passwords-django@2.1...5.1.0)

---
updated-dependencies:
- dependency-name: pwned-passwords-django
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements/main.txt

@@ -18,7 +18,7 @@ huey==2.5.1
 hypercorn[h3]==0.17.3
 jsonfield==3.1.0
 markdown==3.6.0
-pwned-passwords-django==2.1
+pwned-passwords-django==5.1.0
 pyarr==5.2.0
 pymysql==1.1.1
 python-dotenv==1.0.1