Bump actions/checkout from 5 to 6 (#198)

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/testing.yml

@@ -18,7 +18,7 @@ jobs:
         go: ["1.25", "1.24"]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
@@ -35,7 +35,7 @@ jobs:
         go: ["1.25", "1.24"]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
@@ -51,7 +51,7 @@ jobs:
         go: ["1.25", "1.24"]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
@@ -71,7 +71,7 @@ jobs:
         go: ["1.25", "1.24"]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}