chore(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ${{ matrix.os.runner }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust (${{ matrix.toolchain.name }})
         uses: actions-rust-lang/setup-rust-toolchain@v1.15.3

.github/workflows/coverage.yml

@@ -15,7 +15,7 @@ jobs:
   coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1.15.3

.github/workflows/lint.yml

@@ -20,7 +20,7 @@ jobs:
       checks: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1.15.3
@@ -38,7 +38,7 @@ jobs:
   rustfmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust (nightly)
         uses: actions-rust-lang/setup-rust-toolchain@v1.15.3
@@ -52,7 +52,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust (nightly)
         uses: actions-rust-lang/setup-rust-toolchain@v1.15.3
@@ -68,7 +68,7 @@ jobs:
   sorted-deps:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1.15.3

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0