Bump actions/checkout from 5 to 6 (#1049)

* 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>

* do not persist git credentials when not needed

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Brendan <2bndy5@gmail.com>

Author: dependabot[bot]

.github/workflows/build_linux.yml

@@ -75,7 +75,9 @@ jobs:
       CFLAGS: "-I /usr/local/include"
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
 
       - name: provide toolchain
         run: |

.github/workflows/doxygen.yml

@@ -42,7 +42,9 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: 24.x
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
       - name: Install cSpell
         run: npm install -g cspell
       - run: npx cspell --gitignore --config cspell.config.yaml .