Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -30,7 +30,7 @@ jobs:
             os: windows-latest
     name: Deploy ${{ matrix.target }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install Rust
       run: ci/install-rust.sh stable ${{ matrix.target }}
     - name: Build asset
@@ -43,7 +43,7 @@ jobs:
     name: GitHub Pages
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install Rust (rustup)
       run: rustup update stable --no-self-update && rustup default stable
     - name: Deploy the User Guide to GitHub Pages using the gh-pages branch
@@ -56,7 +56,7 @@ jobs:
       id-token: write
     environment: publish
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Rust (rustup)
         run: rustup update stable --no-self-update && rustup default stable
       - name: Authenticate with crates.io

.github/workflows/main.yml

@@ -44,7 +44,7 @@ jobs:
             target: x86_64-unknown-linux-gnu
     name: ${{ matrix.name }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install Rust
       run: bash ci/install-rust.sh ${{ matrix.rust }} ${{ matrix.target }}
     - name: Build and run tests
@@ -55,7 +55,7 @@ jobs:
   aarch64-cross-builds:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install Rust
       run: bash ci/install-rust.sh stable aarch64-unknown-linux-musl
     - name: Build
@@ -65,7 +65,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install Rust
       run: rustup update stable && rustup default stable && rustup component add rustfmt
     - run: cargo fmt --check
@@ -74,7 +74,7 @@ jobs:
     name: GUI tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Rust
         run: bash ci/install-rust.sh stable x86_64-unknown-linux-gnu
       - name: Install npm
@@ -92,7 +92,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Rust
         run: bash ci/install-rust.sh stable x86_64-unknown-linux-gnu
       - run: rustup component add clippy
@@ -102,7 +102,7 @@ jobs:
     name: Check API docs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Rust
         run: bash ci/install-rust.sh stable x86_64-unknown-linux-gnu
       - name: Ensure intradoc links are valid
@@ -114,7 +114,7 @@ jobs:
     name: Check version bump
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: rustup update stable && rustup default stable
       - name: Install cargo-semver-checks
         run: |

.github/workflows/update-dependencies.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'rust-lang/mdBook'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Rust
         run: bash ci/install-rust.sh stable x86_64-unknown-linux-gnu
       - name: Install cargo-edit