[stubsabot] Bump gunicorn to 26.0.0

Release: https://pypi.org/pypi/gunicorn/26.0.0
Homepage: https://gunicorn.org
Repository: https://github.com/benoitc/gunicorn
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/gunicorn
Changelog: https://gunicorn.org/news/
Diff: benoitc/gunicorn@25.3.0...26.0.0

Stubsabot analysis of the diff between the two releases:
 - 48 public Python files have been added.
 - 1 file included in typeshed's stubs has been deleted: `gunicorn/workers/geventlet.py`.
 - 16 files included in typeshed's stubs have been modified or renamed.
 - Total lines of Python code added: 9370.
 - Total lines of Python code deleted: 529.

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- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

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Author: stubsabot

stubs/gunicorn/METADATA.toml

@@ -1,4 +1,4 @@
-version = "25.3.0"
+version = "26.0.0"
 upstream-repository = "https://github.com/benoitc/gunicorn"
 dependencies = ["types-gevent"]