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/dependabot-build.yaml

@@ -10,7 +10,7 @@ jobs:
     name: test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-java@v5
         with:
           distribution: temurin

.github/workflows/deploy.yaml

@@ -15,7 +15,7 @@ jobs:
     name: Build and publish Docker image
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-java@v5
         with:
           distribution: temurin
@@ -57,7 +57,7 @@ jobs:
       id-token: "write"
     environment: dev-gcp
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nais/deploy/actions/deploy@v2
         env:
           CLUSTER: dev-gcp
@@ -75,7 +75,7 @@ jobs:
       id-token: "write"
     environment: prod-gcp
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nais/deploy/actions/deploy@v2
         env:
           CLUSTER: prod-gcp

.github/workflows/publish.yaml

@@ -15,7 +15,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Java and build
         uses: actions/setup-java@v5
         with:
@@ -40,7 +40,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set release tag
         run: |
           export TAG_NAME="1_$(TZ="Europe/Oslo" date +%Y%m%d).$(echo $GITHUB_SHA | cut -c 1-6)"
@@ -57,7 +57,7 @@ jobs:
     permissions:
       packages: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-java@v5
         with:
           distribution: temurin