Bump ko-build/setup-ko from 0.7 to 0.8

Bumps [ko-build/setup-ko](https://github.com/ko-build/setup-ko) from 0.7 to 0.8.
- [Release notes](https://github.com/ko-build/setup-ko/releases)
- [Commits](ko-build/setup-ko@v0.7...v0.8)

---
updated-dependencies:
- dependency-name: ko-build/setup-ko
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build_and_publish.yaml

@@ -30,7 +30,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: ko-build/setup-ko@v0.7
+      - uses: ko-build/setup-ko@v0.8
 
       - name: build and push container images
         run: ./hack/build.sh