Bump actions/checkout from 5 to 6 in the github group

Bumps the github group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: github
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout latest code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v5
         with:

.github/workflows/digestabot.yml

@@ -13,7 +13,7 @@ jobs:
       pull-requests: write
       id-token: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: navikt/digestabot@3233d68167c867ef8227c5dfde7a30f2a0e10af0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}