Fix MySQL authentication-related issues in old PHP

Author: desrosj

.github/workflows/install-testing.yml

@@ -88,17 +88,13 @@ jobs:
           - db-version: '5.0'
           - db-version: '5.1'
           - db-version: '5.5'
-          # The PHP <= 7.3/MySQL 8.4 jobs currently fail due to mysql_native_password being disabled by default. See https://core.trac.wordpress.org/ticket/61218.
-          - php: '7.2'
-            db-version: '8.4'
-          - php: '7.3'
-            db-version: '8.4'
           # Only test the latest innovation release.
           - db-version: '9.0'
           - db-version: '9.1'
           - db-version: '9.2'
           - db-version: '9.3'
           - db-version: '9.4'
+          - db-version: '9.5'
           # 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: '9.6'
@@ -118,7 +114,7 @@ jobs:
           -e MYSQL_ROOT_PASSWORD="root"
           -e MYSQL_DATABASE="test_db"
           --entrypoint sh ${{ matrix.db-type }}:${{ matrix.db-version }}
-          -c "exec docker-entrypoint.sh mysqld${{ matrix.db-type == 'mysql' && contains( fromJSON('["7.2", "7.3"]'), matrix.php ) && ' --default-authentication-plugin=mysql_native_password' || '' }}"
+          -c "exec docker-entrypoint.sh mysqld${{ matrix.db-type == 'mysql' && contains( fromJSON('["5.4", "5.5", "5.6", "7.0", "7.1", "7.2", "7.3"]'), matrix.php ) && ( matrix.db-version == '8.4' && ' --authentication-policy=mysql_native_password' || ' --default-authentication-plugin=mysql_native_password' ) || '' }}"
 
     steps:
       - name: Set up PHP ${{ matrix.php }}