Bump actions/checkout from 5 to 6 (#62)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/matlab_test_and_coverage.yml

@@ -41,7 +41,7 @@ jobs:
             with:
                 release: ${{ matrix.version }}
 
-        -   uses: actions/checkout@v5
+        -   uses: actions/checkout@v6
             with:
                 submodules: true
                 fetch-depth: 1

.github/workflows/octave_test_and_coverage.yml

@@ -17,7 +17,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-        -   uses: actions/checkout@v5
+        -   uses: actions/checkout@v6
             with:
                 submodules: true
                 fetch-depth: 1

.github/workflows/run_precommit.yml

@@ -10,6 +10,6 @@ jobs:
     pre-commit:
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v5
+        -   uses: actions/checkout@v6
         -   uses: actions/setup-python@v6
         -   uses: pre-commit/[email protected]

.github/workflows/update_precommit_hooks.yml

@@ -28,7 +28,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
         -   name: Checkout repo
-            uses: actions/checkout@v5
+            uses: actions/checkout@v6
         -   name: Set up Python
             uses: actions/setup-python@v6
             with:

.github/workflows/validate_cff.yml

@@ -21,7 +21,7 @@ jobs:
 
         steps:
 
-        -   uses: actions/checkout@v5
+        -   uses: actions/checkout@v6
             with:
                 fetch-depth: 1