Build/Test Tools: Test 6.9 in upgrade testing workflows.

This sets 6.9 as the most recent branch of WordPress in the upgrade testing workflows.

Props jorbin.
See #64227, #64235.

git-svn-id: https://develop.svn.wordpress.org/trunk@62042 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.github/workflows/test-old-branches.yml

@@ -25,7 +25,7 @@ on:
 permissions: {}
 
 env:
-  CURRENTLY_SUPPORTED_BRANCH: '6.8'
+  CURRENTLY_SUPPORTED_BRANCH: '6.9'
 
 jobs:
   dispatch-workflows-for-old-branches:

.github/workflows/upgrade-develop-testing.yml

@@ -51,7 +51,15 @@ jobs:
     permissions:
       contents: read
 
-  # Run upgrade tests for the current branch.
+# Because the number of jobs spawned can quickly balloon out of control, the following methodology is applied when
+# building out the matrix below:
+#
+# - The two most recent releases of WordPress are always tested.
+# - After a branch is created, the pre-release version is also added.
+# - The oldest version of WordPress receiving security updates as a courtesy that also runs on a PHP version supported by trunk
+#   should always be tested.
+# - PHP and DB versions are kept to a minimum. In general this should be the highest and lowest supported versions of each with excludes
+#   being updated to keep the matrix as small as is reasonable.
   upgrade-tests-develop:
     name: Upgrade from ${{ matrix.wp }}
     uses: ./.github/workflows/reusable-upgrade-testing.yml
@@ -67,7 +75,7 @@ jobs:
         db-type: [ 'mysql' ]
         db-version: [ '5.7', '8.4' ]
         # WordPress 5.3 is the oldest version that supports PHP 7.4.
-        wp: [ '5.3', '6.7', '6.8', '6.9-RC1' ]
+        wp: [ '5.3', '6.8', '6.9' ]
         multisite: [ false, true ]
     with:
       os: ${{ matrix.os }}
@@ -93,7 +101,7 @@ jobs:
         php: [ '7.4', '8.4' ]
         db-type: [ 'mysql' ]
         db-version: [ '8.4' ]
-        wp: [ '6.7', '6.8' ]
+        wp: [ '6.8', '6.9' ]
         multisite: [ false, true ]
     with:
       os: ${{ matrix.os }}

.github/workflows/upgrade-testing.yml

@@ -71,7 +71,7 @@ jobs:
         php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
         db-type: [ 'mysql' ]
         db-version: [ '5.7', '8.0', '8.4', '9.6' ]
-        wp: [ '6.7', '6.8' ]
+        wp: [ '6.8', '6.9' ]
         multisite: [ false, true ]
     with:
       os: ${{ matrix.os }}