Bump py-vapid from 1.9.4 to 1.9.6 in /docker/main in the crypto group (#24699)

Bumps the crypto group in /docker/main with 1 update: [py-vapid](https://github.com/mozilla-services/vapid).


Updates `py-vapid` from 1.9.4 to 1.9.6
- [Release notes](https://github.com/mozilla-services/vapid/releases)
- [Commits](https://github.com/mozilla-services/vapid/commits)

---
updated-dependencies:
- dependency-name: py-vapid
  dependency-version: 1.9.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: crypto
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docker/main/requirements-wheels.txt

@@ -51,7 +51,7 @@ google-genai == 2.29.*
 ollama == 0.6.*
 openai == 3.26.*
 # push notifications
-py-vapid == 1.9.4
+py-vapid == 1.9.6
 pywebpush == 2.5.*
 # alpr
 pyclipper == 1.4.*