Use composer requirements for psalm action

Signed-off-by: John Molakvoæ <skjnldsv@protonmail.com>

.github/workflows/psalm.yml

@@ -11,14 +11,10 @@ jobs:
   static-psalm-analysis:
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        ocp-version: [ 'dev-master' ]
-
     name: Nextcloud ${{ matrix.ocp-version }}
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v3
 
       - name: Set up php
         uses: shivammathur/setup-php@v2
@@ -29,8 +25,5 @@ jobs:
       - name: Install dependencies
         run: composer i
 
-      - name: Install dependencies
-        run: composer require --dev christophwurst/nextcloud:${{ matrix.ocp-version }}
-
       - name: Run coding standards check
         run: composer run psalm