Merge pull request matplotlib#22184 from oscargus/gh310

CI: Removed dev from 3.10-version in GHA config

Author: tacaswell

.github/workflows/tests.yml

@@ -43,7 +43,7 @@ jobs:
             extra-requirements: '-r requirements/testing/extra.txt'
             XVFB_RUN: xvfb-run -a
           - os: ubuntu-20.04
-            python-version: '3.10-dev'
+            python-version: '3.10'
             # Re-add this when extra dependencies have wheels.
             # extra-requirements: '-r requirements/testing/extra.txt'
             XVFB_RUN: xvfb-run -a