Revert "Use dependabot (#73)" (#79)

This reverts commit 1a0a1df.

Author: OskarStark

.github/dependabot.yml

@@ -7,12 +7,12 @@ name: Test
 jobs:
   phpstan:
     name: PHPStan
-
+    
     runs-on: ubuntu-latest
-
+    
     steps:
         - name: "Checkout"
-          uses: actions/checkout@v4
+          uses: actions/checkout@v3
 
         - name: PHPStan
           uses: docker://oskarstark/phpstan-ga