chore(CI): Adjust testing matrix for Nextcloud 30 on stable30

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/workflows/cypress-e2e.yml

@@ -22,7 +22,7 @@ jobs:
         node-version: [20.x]
         # containers: [1, 2, 3]
         php-versions: [ '8.2' ]
-        server-versions: [ 'master' ]
+        server-versions: [ 'stable30' ]
 
     env:
       extensions: mbstring, iconv, fileinfo, intl, sqlite, pdo_sqlite, zip, gd, apcu

.github/workflows/integration.yml

@@ -28,7 +28,7 @@ jobs:
       matrix:
         php-versions: ['8.1']
         databases: ['sqlite', 'mysql', 'pgsql']
-        server-versions: ['master']
+        server-versions: ['stable30']
 
     name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}