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] <[email protected]>

Author: dependabot[bot]

.github/workflows/audit.yml

@@ -21,6 +21,6 @@ jobs:
       issues: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Audit Rust Dependencies
         uses: actions-rust-lang/audit@v1

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Checkout directory
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache dependencies
         uses: Swatinem/rust-cache@v2
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Checkout directory
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache dependencies
         uses: Swatinem/rust-cache@v2
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Checkout directory
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache dependencies
         uses: Swatinem/rust-cache@v2
@@ -62,7 +62,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Checkout directory
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache dependencies
         uses: Swatinem/rust-cache@v2

.github/workflows/release-plz.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - &checkout
         name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: true