add write permissions for dependabot workflow

Author: swissiety

.github/workflows/dependabot.yml

@@ -4,6 +4,10 @@ on:
   pull_request:
     types: [opened, reopened, synchronize]
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   ApproveAndMerge:
     name: Auto approve Dependabot PRs