ci: make Python 3.9 minimum required build (#13066)

* chore: make Python 3.9 minimum required build

* chore: update README badges

* chore: ignore Python 3.8 as new default

---------

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Author: jackwotherspoon

.github/sync-repo-settings.yaml

@@ -44,7 +44,7 @@ branchProtectionRules:
   requiredStatusCheckContexts:
     - "Kokoro CI - Lint"
     - "Kokoro CI - Python 2.7 (App Engine Standard Only)"
-    - "Kokoro CI - Python 3.8"
+    - "Kokoro CI - Python 3.9"
     - "Kokoro CI - Python 3.13"
     - "cla/google"
     - "snippet-bot check"

AUTHORING_GUIDE.md

@@ -22,7 +22,6 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    # Skipping for Python 3.9 due to pyarrow compilation failure.
     "ignored_versions": ["2.7", "3.7"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them

README.md

@@ -22,7 +22,6 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    # Skipping for Python 3.9 due to pyarrow compilation failure.
     "ignored_versions": ["2.7", "3.7"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them

appengine/flexible/analytics/noxfile_config.py

@@ -22,7 +22,6 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    # Skipping for Python 3.9 due to pyarrow compilation failure.
     "ignored_versions": ["2.7", "3.7"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them

appengine/flexible/datastore/noxfile_config.py

@@ -22,7 +22,7 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    "ignored_versions": ["2.7", "3.7", "3.9", "3.10", "3.12", "3.13"],
+    "ignored_versions": ["2.7", "3.7", "3.8", "3.10", "3.12", "3.13"],
     # An envvar key for determining the project id to use. Change it
     # to 'BUILD_SPECIFIC_GCLOUD_PROJECT' if you want to opt in using a
     # build specific Cloud project. You can also use your own string

appengine/flexible/disk/noxfile_config.py

@@ -22,7 +22,6 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    # Skipping for Python 3.9 due to pyarrow compilation failure.
     "ignored_versions": ["2.7", "3.7"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them

appengine/flexible/django_cloudsql/noxfile_config.py

@@ -22,7 +22,6 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    # Skipping for Python 3.9 due to pyarrow compilation failure.
     "ignored_versions": ["2.7", "3.7"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them

appengine/flexible/extending_runtime/noxfile_config.py

@@ -22,7 +22,6 @@
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    # Skipping for Python 3.9 due to pyarrow compilation failure.
     "ignored_versions": ["2.7", "3.7"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them