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] <support@github.com>

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions-rs/toolchain@v1
       with:
         toolchain: stable
@@ -43,7 +43,7 @@ jobs:
     name: Build using minimum versions of dependencies
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nightly Rust
         uses: actions-rs/toolchain@v1
         with:
@@ -63,7 +63,7 @@ jobs:
     name: Test and coverage
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install cargo-llvm-cov
       uses: taiki-e/install-action@cargo-llvm-cov
     - name: Test and gather coverage
@@ -76,7 +76,7 @@ jobs:
     name: Lint with clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -87,7 +87,7 @@ jobs:
     name: Check code formatting
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: nightly
@@ -100,7 +100,7 @@ jobs:
     env:
       RUSTDOCFLAGS: '-A unknown_lints -A renamed_and_removed_lints -D warnings'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable