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] <[email protected]>

Author: dependabot[bot]

.github/workflows/go.yml

@@ -6,7 +6,7 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-go@v6
       with:
         go-version-file: src/brats/go.mod

.github/workflows/ruby.yml

@@ -12,7 +12,7 @@ jobs:
         - nats_sync:parallel
         - release
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with: { lfs: true}
     - uses: ruby/setup-ruby@v1
       with: { working-directory: src/ }
@@ -29,7 +29,7 @@ jobs:
         - mysql
         - postgresql
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with: { lfs: true}
     - uses: ruby/setup-ruby@v1
       with: { working-directory: src/ }