ci: bump actions/checkout from 4 to 7 (#1)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     container: swift:6.1
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - run: swift --version
       - run: swift build
       - run: swift test
@@ -24,7 +24,7 @@ jobs:
     name: Build & test (macOS)
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - run: swift --version
       - run: swift build -c release
       - run: swift test
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     container: swift:6.1
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Download shared conformance vectors
         run: |
           apt-get update -qq && apt-get install -y -qq curl

.github/workflows/commit-lint.yml

@@ -12,7 +12,7 @@ jobs:
     name: Conventional Commits
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - name: Check commit subjects follow Conventional Commits