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/build_docs.yaml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
 

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout master branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: master
       - name: Bump version and push tag
@@ -51,7 +51,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
         ref: master
@@ -137,7 +137,7 @@ jobs:
     steps:
 
       - name: Checkout master branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: master
           fetch-tags: true

.github/workflows/test.yaml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
 

.github/workflows/test_releases.yml

@@ -16,7 +16,7 @@ jobs:
         shell: bash -l {0}
     steps:
     - name: Checkout source
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Fetch all Git tags
       run: git fetch --prune --unshallow --tags
     - name: Get current date