chore(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...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>

.github/workflows/audit.yaml

@@ -7,7 +7,7 @@ jobs:
   security_audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: cargo generate-lockfile # create Cargo.lock
       - uses: rustsec/audit-check@v2.0.0
         with:

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Cache Dependencies
         uses: Swatinem/rust-cache@v2
@@ -84,7 +84,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Cache QEMU
         id: cache-qemu
@@ -152,7 +152,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Configure Rust target ${{ matrix.input.rustup-target }}
         run: rustup target add ${{ matrix.input.rustup-target }}
@@ -228,7 +228,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Cache Dependencies
         uses: Swatinem/rust-cache@v2
@@ -248,7 +248,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Run cargo test
         run: cargo xtask --deny-warnings test --loom rtic-sync
@@ -259,7 +259,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install lychee
         uses: taiki-e/install-action@v2
@@ -310,7 +310,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install lychee
         uses: taiki-e/install-action@v2
@@ -365,7 +365,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install mdbook
         uses: taiki-e/install-action@v2
@@ -443,7 +443,7 @@ jobs:
       versionmajor: ${{ steps.parseversion.outputs.versionmajor }}
       version: ${{ steps.parseversion.outputs.version }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Get crate version and print output branch release/vX
         id: parseversion
@@ -480,7 +480,7 @@ jobs:
     # Only run this when pushing to master branch
     if: github.ref == 'refs/heads/master'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Push to stable release branch if master contains stable version
         if: ${{ env.versionmajor == env.STABLE_VERSION }}
@@ -510,7 +510,7 @@ jobs:
     # Only run this when pushing to master branch
     if: github.ref == 'refs/heads/master'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install lychee
         uses: taiki-e/install-action@v2

.github/workflows/changelog.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Check which component is modified 
         uses: dorny/paths-filter@v3

.github/workflows/clippy-check-example.yml

@@ -29,7 +29,7 @@ jobs:
     name: Validate platform ${{ inputs.platform }}, backend ${{ inputs.backend }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Configure Rust target ${{ inputs.rustup-target }}
         run: rustup target add ${{ inputs.rustup-target }}
@@ -44,7 +44,7 @@ jobs:
     name: Check examples
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Configure Rust target ${{ inputs.rustup-target }}
         run: rustup target add ${{ inputs.rustup-target }}
@@ -60,7 +60,7 @@ jobs:
     name: Run clippy
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Configure Rust target ${{ inputs.rustup-target }}
       run:  rustup target add ${{ inputs.rustup-target }}