Prevent dependabot from proposing Python version upgrades beyond 3.11. (

#6772)

* OBS-375: Prevent dependabot from proposing Python version upgrades beyond 3.11.

* OBS-375: Document how to upgrade to a new Python version.

.github/dependabot.yml

@@ -12,6 +12,9 @@ updates:
     schedule:
       interval: "weekly"
     open-pull-requests-limit: 10
+    ignore:
+      - dependency-name: python
+        versions: [">=3.12"]
 
   # Set update schedule for GitHub Actions
   - package-ecosystem: "github-actions"

docker/Dockerfile

@@ -5,6 +5,8 @@
 # https://hub.docker.com/_/python
 # NOTE(willkg): stick with slim-bullseye which matches how we build the
 # stackwalker
+# NOTE(smarnach): To upgrade Python to a new minor or major version, see
+# https://socorro.readthedocs.io/en/latest/dev.html#upgrading-to-a-new-python-version
 FROM --platform=linux/amd64 python:3.11.10-slim-bullseye@sha256:f6a64ef0a5cc14855b15548056a8fc77f4c3526b79883fa6709a8e23f676ac34 AS app_amd64
 
 # Set up user and group

docs/dev.rst

@@ -646,6 +646,23 @@ pick up changes:
    $ make devcontainer
 
 
+Upgrading to a new Python version
+=================================
+
+To upgrade Python to a new minor or major version, you need to change the version in
+these files:
+
+* ``.devcontainer/Dockerfile``
+* ``.github/dependabot.yml``
+* ``.readthedocs.yaml``
+* ``docker/Dockerfile``
+* ``docker/Dockerfile.fakesentry``
+* ``docker/set_up_legacy_es_requirements.sh``
+* ``pyproject.toml``
+* ``socorro/tests/processor/test_processor_app.py``
+* ``webapp/crashstats/crashstats/tests/test_sentry.py``
+
+
 Processing crashes
 ==================