chore(CI): Adjust testing matrix for Nextcloud 26 on stable26

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

Author: nickvergessen

.github/workflows/phpunit-mysql.yml

@@ -38,8 +38,8 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['8.0', '8.1']
-        server-versions: ['master']
+        php-versions: ['8.0', '8.1', '8.2']
+        server-versions: ['stable26']
 
     services:
       mysql:

.github/workflows/phpunit-pgsql.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable26']
 
     services:
       postgres:

.github/workflows/phpunit-sqlite.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable26']
 
     steps:
       - name: Set app env