[deps] Update pyopenssl requirement from ~=24.1.0 to ~=24.2.1

Updates the requirements on [pyopenssl](https://github.com/pyca/pyopenssl) to permit the latest version.
- [Changelog](https://github.com/pyca/pyopenssl/blob/main/CHANGELOG.rst)
- [Commits](pyca/pyopenssl@24.1.0...24.2.1)

---
updated-dependencies:
- dependency-name: pyopenssl
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Federico Capoano <[email protected]>

requirements.txt

@@ -3,4 +3,4 @@ django>=3.2.18,!=4.0.*,<4.3
 openwisp-utils @ https://github.com/openwisp/openwisp-utils/tarball/master
 jsonfield>=3.1.0,<4.0.0
 cryptography~=42.0.8
-pyOpenSSL~=24.1.0
+pyOpenSSL~=24.2.1