Bump actions/checkout from 3 to 4 (#48)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     name: runner / dotenv-linter
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: dotenv-linter
         uses: ./
         with:
@@ -19,7 +19,7 @@ jobs:
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: dotenv-linter (platform)
         uses: ./
         with:
@@ -31,7 +31,7 @@ jobs:
     name: runner / dotenv-linter (github-pr-check)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: dotenv-linter w/ github-pr-check
         uses: ./
         with:
@@ -45,7 +45,7 @@ jobs:
     name: runner / dotenv-linter (github-pr-review)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: dotenv-linter w/ github-pr-review
         uses: ./
         with:
@@ -59,7 +59,7 @@ jobs:
     name: runner / dotenv-linter (github-code-suggestions)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: dotenv-linter w/ github-code-suggestions
         uses: ./
         with:

.github/workflows/depup.yml

@@ -10,7 +10,7 @@ jobs:
   reviewdog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haya14busa/action-depup@v1
         id: depup
         with:
@@ -35,7 +35,7 @@ jobs:
   dotenv-linter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haya14busa/action-depup@v1
         id: depup
         with:

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.event.action != 'labeled'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Bump version on merging Pull Requests with specific labels.
       # (bump:major,bump:minor,bump:patch)
@@ -54,6 +54,6 @@ jobs:
     if: github.event.action == 'labeled'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Post bumpr status comment
         uses: haya14busa/action-bumpr@v1

.github/workflows/reviewdog.yml

@@ -6,7 +6,7 @@ jobs:
     name: runner / shellcheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: shellcheck
         uses: reviewdog/action-shellcheck@v1
         with:
@@ -16,7 +16,7 @@ jobs:
     name: runner / misspell
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: misspell
         uses: reviewdog/action-misspell@v1
         with:
@@ -27,7 +27,7 @@ jobs:
     name: check / yamllint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: yamllint
         uses: reviewdog/action-yamllint@v1
         with: