Try to fix github actions

Author: LinusDierheimer

.github/workflows/pull_request.yml

@@ -11,4 +11,4 @@ jobs:
         uses: actions/checkout@v2
 
       - name: run build and check
-        uses: ./.github/workflows/check.yml
+        uses: ./.github/workflows/check.yml@master

.github/workflows/push.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: run build and check
-        uses: ./.github/workflows/check.yml
+        uses: ./.github/workflows/check.yml@master
 
       - name: get fastfetch version
         id: get_version_fastfetch