Bump actions/checkout from 5 to 6 (#660)

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](https://github.com/actions/checkout/compare/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>

.github/workflows/go.yml

@@ -15,7 +15,7 @@ jobs:
   db-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: '1.25'

.github/workflows/release.yaml

@@ -18,7 +18,7 @@ jobs:
     steps:
       # 1. Checkout the repository
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # 2. Setup node & npm
       - name: Setup Node.js
@@ -53,7 +53,7 @@ jobs:
     steps:
       # 1. Checkout the repository
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
 
@@ -106,7 +106,7 @@ jobs:
     steps:
       # 1. Checkout the repository
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
       # 2. Extract release notes from CHANGELOG.md

.github/workflows/web.yaml

@@ -19,7 +19,7 @@ jobs:
         working-directory: web
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with: