Update pyopenssl requirement from >=23.2.0 to >=26.0.0

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@23.2.0...26.0.0)

---
updated-dependencies:
- dependency-name: pyopenssl
  dependency-version: 26.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/ocsp.txt

@@ -7,7 +7,7 @@
 # pyopenssl, cryptography, and service_identity must be set in tandem.
 # https://www.pyopenssl.org/en/stable/api/ssl.html#OpenSSL.SSL.Context.set_default_verify_paths
 certifi>=2023.7.22;os.name=='nt' or sys_platform=='darwin'
-pyopenssl>=23.2.0
+pyopenssl>=26.0.0
 requests>=2.23.0,<3.0
 cryptography>=42.0.0
 service_identity>=23.1.0