Pin gunicorn <26 because eventlet support is dropped.

Lockfile diff: lockfiles/st2.lock [st2]
==                    Upgraded dependencies                     ==
  charset-normalizer             3.4.8        -->   3.4.9
  filelock                       3.29.6       -->   3.29.7
==                !! Downgraded dependencies !!                 ==
  gunicorn                       26.0.0       -->   25.3.0

Author: nzlosh

fixed-requirements.txt

@@ -18,7 +18,8 @@ gitpython==3.1.45
 gitdb==4.0.12
 # Note: greenlet is used by eventlet
 greenlet==3.1.1
-gunicorn==23.0.0
+# Gunicorn dropped eventlet support as of v26. https://gunicorn.org/news/#2600-2026-05-05
+gunicorn<26
 # importlib backport replaces setuptool's pkg_resource.
 importlib_resources==6.5.2
 importlib_metadata==9.0.0

lockfiles/st2.lock

@@ -20,7 +20,8 @@ gitdb
 gitpython
 # st2common/tests/integration/test_util_green.py requires greenlet (as does eventlet)
 greenlet
-gunicorn
+# Gunicorn dropped eventlet support as of v26. https://gunicorn.org/news/#2600-2026-05-05
+gunicorn<26
 # importlib backport to replace pkg_resource from setuptools.
 importlib-metadata
 importlib-resources

requirements-pants.txt

@@ -22,7 +22,7 @@ eventlet==0.39.1
 gitdb==4.0.12
 gitpython==3.1.45
 greenlet==3.1.1
-gunicorn==23.0.0
+gunicorn<26
 importlib-metadata
 importlib_resources==6.5.2
 jinja2==3.1.6

requirements.txt

@@ -7,7 +7,7 @@
 # update the component requirements.txt
 backports.zoneinfo[tzdata]; python_version<"3.9"
 eventlet==0.39.1
-gunicorn==23.0.0
+gunicorn<26
 jsonschema==4.26.0
 kombu==5.5.4
 mongoengine==0.29.1

st2api/requirements.txt

@@ -7,7 +7,7 @@
 # update the component requirements.txt
 bcrypt==5.0.0
 eventlet==0.39.1
-gunicorn==23.0.0
+gunicorn<26
 oslo.config==9.6.0
 pymongo==4.6.3
 six==1.17.0

st2auth/requirements.txt

@@ -7,7 +7,7 @@
 # update the component requirements.txt
 backports.zoneinfo[tzdata]; python_version<"3.9"
 eventlet==0.39.1
-gunicorn==23.0.0
+gunicorn<26
 jsonschema==4.26.0
 kombu==5.5.4
 mongoengine==0.29.1