Bump actions/checkout from 3 to 4 (#328)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -15,23 +15,23 @@ jobs:
   check_spelling:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Check Spelling
         uses: crate-ci/[email protected]
   check_format:
     runs-on: ubuntu-latest
     container:
       image: crystallang/crystal:latest-alpine
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Check Format
         run: crystal tool format --check
   coding_standards:
     runs-on: ubuntu-latest
     container:
       image: crystallang/crystal:latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: shards install
         env:
@@ -51,9 +51,9 @@ jobs:
           - nightly
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         if: github.event_name != 'pull_request'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         if: github.event_name == 'pull_request'
         with:
           fetch-depth: 0

.github/workflows/sync.yml

@@ -9,7 +9,7 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           token: ${{ secrets.SYNC_TOKEN }}