Bump gevent from 25.8.1 to 26.4.0

Bumps [gevent](https://github.com/gevent/gevent) from 25.8.1 to 26.4.0.
- [Release notes](https://github.com/gevent/gevent/releases)
- [Changelog](https://github.com/gevent/gevent/blob/master/docs/changelog_pre.rst)
- [Commits](gevent/gevent@25.8.1...26.4.0)

---
updated-dependencies:
- dependency-name: gevent
  dependency-version: 26.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

constraints.txt

@@ -8,7 +8,7 @@ certifi==2026.1.4
 chardet==5.2.0
 charset-normalizer==3.4.4
 coverage==7.9.2
-gevent==25.8.1
+gevent==26.4.0
 greenlet==3.3.1
 h11==0.16.0
 httpcore==1.0.9

pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
     "pycryptodomex==3.23.0",  # https://github.com/Legrandin/pycryptodome/blob/master/Changelog.rst
     "psutil>=5.5,<7.1",       # https://github.com/giampaolo/psutil/blob/master/HISTORY.rst
     "requests==2.32.3",       # https://pypi.python.org/pypi/requests
-    "gevent==25.8.1",         # http://www.gevent.org/changelog.html
+    "gevent==26.4.0",         # http://www.gevent.org/changelog.html
     "greenlet>=3.0rc1",
     "werkzeug==3.1.5",        # https://werkzeug.palletsprojects.com/en/stable/changes/
     "backports.ssl-match-hostname==3.7.0.1", # required by tornado<5.0