github-actions: bump actions/checkout from 3 to 4 (#47)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     env:
       DOCKER_IMAGE: ghcr.io/${{ github.repository }}/${{ github.event.repository.name }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Login to GitHub Docker Registry
         uses: docker/login-action@v2
         with:

.github/workflows/deploy_gcp.yml

@@ -16,7 +16,7 @@ jobs:
     name: Deploy to GCP
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Create artifact version
         id: artifact-version
         uses: navikt/sosialhjelp-ci/actions/create-artifact-version@v2