Bump andstor/file-existence-action from 2 to 3 (#188)

Bumps [andstor/file-existence-action](https://github.com/andstor/file-existence-action) from 2 to 3.
- [Release notes](https://github.com/andstor/file-existence-action/releases)
- [Commits](andstor/file-existence-action@v2...v3)

---
updated-dependencies:
- dependency-name: andstor/file-existence-action
  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>

.github/workflows/.deploy.yaml

@@ -33,7 +33,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v4
-      - uses: andstor/file-existence-action@v2
+      - uses: andstor/file-existence-action@v3
         id: check_files
         with:
           files: "apps/${{ github.workflow }}/.nais/prod.yaml"