Upgrade CI actions

Author: carlhoerberg

.github/workflows/ci.yml

@@ -6,18 +6,18 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: crystal-ameba/github-action@v0.2.12
+      - uses: actions/checkout@v4
+      - uses: crystal-ameba/github-action@v0.12.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - uses: crystal-lang/install-crystal@v1
-      - run: crystal tool format && git diff --exit-code
+      - run: crystal tool format --check
 
   spec:
     name: Spec
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: crystal-lang/install-crystal@v1
       - run: shards install --ignore-crystal-version
       - run: crystal spec --order random