Bump actions/checkout from 3 to 4

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]>

.github/workflows/lint.yaml

@@ -11,7 +11,7 @@ jobs:
     name: clippy-lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions-rs/clippy-check@v1
       with:
         name: clippy-summary
@@ -20,13 +20,13 @@ jobs:
     name: markdown-lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: DavidAnson/markdownlint-cli2-action@v10
       with:
         globs: "**/*.md"
   yaml-lint:
     name: yaml-lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ibiqlik/action-yamllint@v3

.github/workflows/mirror.yaml

@@ -11,7 +11,7 @@ jobs:
     name: gitlab
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Push to gitlab

.github/workflows/test.yaml

@@ -11,7 +11,7 @@ jobs:
     name: cargo-test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions-rs/cargo@v1
       with:
         command: test