CI: Update actions/checkout to v7

Author: Watson1978

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
           - { full: 7.1.2-22, major-minor: '7.1' }
     name: Lint (Ruby ${{ matrix.ruby-version }}, ImageMagick ${{ matrix.imagemagick-version.major-minor }})
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
       with:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Cache ImageMagick
@@ -54,7 +54,7 @@ jobs:
           - { full: 7.1.2-22, major-minor: '7.1' }
     name: Check RBS (Ruby ${{ matrix.ruby-version }}, ImageMagick ${{ matrix.imagemagick-version.major-minor }})
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
       with:
         ref: ${{ github.event.pull_request.head.sha }}
     - name: Cache ImageMagick
@@ -90,7 +90,7 @@ jobs:
           - { full: 7.1.2-22, major-minor: '7.1' }
     name: Ruby ${{ matrix.ruby-version }}
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Cache ImageMagick
       uses: actions/cache@v5
       with:
@@ -118,7 +118,7 @@ jobs:
         ruby-version: ['9.4.7.0']
     name: JRuby ${{ matrix.ruby-version }}
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         ruby: [ 'ruby', 'jruby' ]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}