Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

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

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
           go-version-file: 'go.mod'
@@ -22,7 +22,7 @@ jobs:
   release-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v5
@@ -49,7 +49,7 @@ jobs:
       - name: Trellis version
         run: git log -1 --format="%h %s %aD"
         working-directory: /test/dummy/trellis
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/cache@v2
         with:
           path: |

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
   goreleaser:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v5