[github-actions]: Bump actions/checkout from 5 to 6 (#57)

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/ci.yml

@@ -61,7 +61,7 @@ jobs:
     runs-on: "${{ matrix.os }}"
     steps:
       # https://github.com/actions/checkout
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # https://github.com/actions/setup-go/
       - name: Set up Go
@@ -101,7 +101,7 @@ jobs:
     runs-on: "${{ matrix.os }}"
     steps:
       # https://github.com/actions/checkout
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # https://github.com/actions/setup-go/
       - name: Set up Go
@@ -134,7 +134,7 @@ jobs:
         working-directory: ./${{ inputs.mod_path }}
     steps:
       # https://github.com/actions/checkout
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # https://github.com/actions/setup-go/
       - name: set up go

.github/workflows/sub_scripts.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
 
       # https://github.com/actions/checkout
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # https://github.com/actions/setup-go/
       - name: Set up Go