[deps] Update pyopenssl requirement from ~=24.2.1 to ~=24.3.0

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@24.2.1...24.3.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -3,4 +3,4 @@ django>=3.2.18,!=4.0.*,<5.2
 openwisp-utils~=1.1.1
 jsonfield>=3.1.0,<4.0.0
 cryptography~=43.0.3
-pyOpenSSL~=24.2.1
+pyOpenSSL~=24.3.0