Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:

.github/workflows/test-activerecord.yml

@@ -21,7 +21,7 @@ jobs:
           postgresql db: slack_ruby_bot_server_test
           postgresql user: test
           postgresql password: password
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.entry.ruby }}

.github/workflows/test-mongodb.yml

@@ -17,7 +17,7 @@ jobs:
       MONGOID_VERSION: ${{ matrix.entry.mongoid }}
       GRAPE_VERSION: ${{ matrix.entry.grape }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.entry.ruby }}

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
           - { ruby: 3.4 }
     name: test (ruby=${{ matrix.entry.ruby }})
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.entry.ruby }}