Bump pyopenssl in /circleci/images/pgupgradetester/files/etc

Bumps [pyopenssl](https://github.com/pyca/pyopenssl) from 25.3.0 to 26.0.0.
- [Changelog](https://github.com/pyca/pyopenssl/blob/main/CHANGELOG.rst)
- [Commits](pyca/pyopenssl@25.3.0...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]

circleci/images/pgupgradetester/files/etc/requirements.txt

@@ -43,7 +43,7 @@ pyasn1-modules==0.4.2; python_version >= '3.8'
 pycparser==3.0; python_version >= '3.10'
 pygments==2.19.2; python_version >= '3.8'
 pylsqpack==0.3.23; python_version >= '3.10'
-pyopenssl==25.3.0; python_version >= '3.7'
+pyopenssl==26.0.0; python_version >= '3.7'
 pyparsing==3.2.5; python_version >= '3.9'
 pyperclip==1.9.0
 pytest==9.0.2; python_version >= '3.10'