chore(CI): Adjust testing matrix for Nextcloud 28 on stable28

Signed-off-by: Joas Schilling <[email protected]>

.github/workflows/performance.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.1']
-        server-versions: ['master']
+        server-versions: ['stable28']
 
     steps:
       - name: Set app env

.github/workflows/phpunit-mysql.yml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0', '8.1', '8.2', '8.3']
-        server-versions: ['master']
+        server-versions: ['stable28']
 
     services:
       mysql:

.github/workflows/phpunit-oci.yml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable28']
 
     services:
       oracle:

.github/workflows/phpunit-pgsql.yml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable28']
 
     services:
       postgres:

.github/workflows/phpunit-sqlite.yml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0']
-        server-versions: ['master']
+        server-versions: ['stable28']
 
     steps:
       - name: Set app env

composer.json

@@ -10,7 +10,7 @@
 	"require-dev": {
 		"bamarni/composer-bin-plugin": "^1.8",
 		"nextcloud/coding-standard": "^1.1",
-		"nextcloud/ocp": "dev-master",
+		"nextcloud/ocp": "dev-stable28",
 		"phpunit/phpunit": "^9.6",
 		"vimeo/psalm": "^5.14"
 	},