Revert to chartboost/ruff-action

Looks like it works actually, we just forgot to add "check" to the overwritten args parameter

.github/workflows/checks.yml

@@ -1,16 +1,12 @@
 name: Checks
 
-on:
-  push:
-    branches:
-      - "main"
-  pull_request:
+on: [push, pull_request]
 
 jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: nkarasiak/ruff-action@v2
+      - uses: chartboost/ruff-action@v1
         with:
-          args: --output-format github
+          args: 'check --output-format github'