ci(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

@@ -23,7 +23,7 @@ jobs:
           - beta
           - nightly
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@master
@@ -60,7 +60,7 @@ jobs:
         target:
           - x86_64-unknown-linux-gnu
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@master
@@ -85,7 +85,7 @@ jobs:
     name: Security Audit
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable

.github/workflows/github_pages.yml

@@ -24,7 +24,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable

.github/workflows/nightly.yml

@@ -16,7 +16,7 @@ jobs:
     name: Nightly Test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust nightly toolchain
       uses: dtolnay/rust-toolchain@master
@@ -46,7 +46,7 @@ jobs:
     name: Dependency Update Check
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable
@@ -68,7 +68,7 @@ jobs:
     name: Benchmark
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable

.github/workflows/release.yml

@@ -50,7 +50,7 @@ jobs:
             asset_name: openprot-macos-x86_64
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable
@@ -119,7 +119,7 @@ jobs:
     needs: build-release
     if: startsWith(github.ref, 'refs/tags/')
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable