Try updating python to avoid error

Author: mhvk

.github/workflows/ci_cron_monthly.yml

@@ -10,6 +10,19 @@ on:
     types:
       - synchronize
       - labeled
+  push:
+    # We want this workflow to always run on release branches as well as
+    # all tags since we want to be really sure we don't introduce
+    # regressions on the release branches, and it's also important to run
+    # this on pre-release and release tags.
+    branches:
+    - 'v*'
+    tags:
+    - '*'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   test_more_architectures:
@@ -21,7 +34,7 @@ jobs:
     name: Test on ${{ matrix.arch }}
     # Don't run on forks of the repository.
     if: (github.repository == 'mhvk/baseband' && (github.event_name == 'schedule' || contains(github.event.pull_request.labels.*.name, 'Extra CI')))
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       apt_packages: git python3-astropy python3-pip