build(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] <[email protected]>

Author: dependabot[bot]

.github/workflows/book.yml

@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v2
         with:

.github/workflows/codecov.yml

@@ -11,7 +11,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: taiki-e/install-action@cargo-llvm-cov
       - shell: bash

.github/workflows/rust.yml

@@ -15,7 +15,7 @@ jobs:
     name: test on freebsd
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: test on freebsd
         uses: vmactions/freebsd-vm@v1
         with:
@@ -39,7 +39,7 @@ jobs:
     name: test on solaris
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: test on Solaris
         uses: vmactions/solaris-vm@v1
         with:
@@ -64,7 +64,7 @@ jobs:
     name: test on illumos
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: test on Illumos
         uses: vmactions/omnios-vm@v1
         with:
@@ -92,7 +92,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
@@ -111,7 +111,7 @@ jobs:
   test-aws-lc-rs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       # Prevent feature unification from selecting *ring* as the crypto provider
@@ -127,7 +127,7 @@ jobs:
     name: test wasm32-unknown-unknown
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - run: rustup target add wasm32-unknown-unknown
       - uses: actions/setup-node@v6
@@ -156,7 +156,7 @@ jobs:
   msrv:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       # Note that we must also update the README when changing the MSRV
       - uses: dtolnay/[email protected]
       - uses: Swatinem/rust-cache@v2
@@ -165,7 +165,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt, clippy
@@ -188,7 +188,7 @@ jobs:
   audit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: EmbarkStudios/cargo-deny-action@v2
 
   test-android:
@@ -210,7 +210,7 @@ jobs:
       run: echo "API_LEVEL=${{ matrix.api-level }}" >> $GITHUB_ENV
 
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install JDK
       uses: actions/setup-java@v5
@@ -263,7 +263,7 @@ jobs:
       # skip FIPS features outside of Linux
       SKIP_FEATURES: ${{ matrix.os != 'ubuntu-latest' && 'rustls-aws-lc-rs-fips,aws-lc-rs-fips,__rustls-post-quantum-test' || '' }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: taiki-e/install-action@cargo-hack
       - run: cargo hack check --feature-powerset --depth 3 --optional-deps --no-dev-deps --ignore-private --skip "${{env.SKIP_FEATURES}}"