Build/Test Tools: Test against MySQL 9.1.

This is the latest innovation release from MySQL.

Props johnbillion, jorbin.
See #62221.

git-svn-id: https://develop.svn.wordpress.org/trunk@59585 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/install-testing.yml

@@ -90,11 +90,13 @@ jobs:
             db-version: '8.4'
           - php: '7.3'
             db-version: '8.4'
+          # Only test the latest innovation release.
+          - db-version: '9.0'
           # MySQL 9.0+ will not work on PHP 7.2 & 7.3. See https://core.trac.wordpress.org/ticket/61218.
           - php: '7.2'
-            db-version: '9.0'
+            db-version: '9.1'
           - php: '7.3'
-            db-version: '9.0'
+            db-version: '9.1'
 
     services:
       database:

.github/workflows/local-docker-environment.yml

@@ -90,11 +90,13 @@ jobs:
         exclude:
           # MySQL containers <= 5.5 do not exist or fail to start properly.
           - db-version: '5.5'
+          # Only test the latest innovation release.
+          - db-version: '9.0'
           # MySQL 9.0+ will not work on PHP 7.2 & 7.3. See https://core.trac.wordpress.org/ticket/61218.
           - php: '7.2'
-            db-version: '9.0'
+            db-version: '9.1'
           - php: '7.3'
-            db-version: '9.0'
+            db-version: '9.1'
 
     with:
       os: ${{ matrix.os }}

.github/workflows/phpunit-tests.yml

@@ -47,7 +47,7 @@ jobs:
         os: [ ubuntu-latest ]
         php: [ '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
         db-type: [ 'mysql' ]
-        db-version: [ '5.7', '8.0', '8.4', '9.0' ]
+        db-version: [ '5.7', '8.0', '8.4', '9.1' ]
         tests-domain: [ 'example.org' ]
         multisite: [ false, true ]
         memcached: [ false ]
@@ -95,9 +95,9 @@ jobs:
         exclude:
           # MySQL 9.0+ will not work on PHP 7.2 & 7.3. See https://core.trac.wordpress.org/ticket/61218.
           - php: '7.2'
-            db-version: '9.0'
+            db-version: '9.1'
           - php: '7.3'
-            db-version: '9.0'
+            db-version: '9.1'
 
     with:
       os: ${{ matrix.os }}

.version-support-mysql.json

@@ -1,5 +1,6 @@
 {
 	"6-8": [
+		"9.1",
 		"9.0",
 		"8.4",
 		"8.0",