build(deps): bump zendesk/setup-jsonnet from 11 to 12

Bumps [zendesk/setup-jsonnet](https://github.com/zendesk/setup-jsonnet) from 11 to 12.
- [Release notes](https://github.com/zendesk/setup-jsonnet/releases)
- [Commits](zendesk/setup-jsonnet@v11...v12)

---
updated-dependencies:
- dependency-name: zendesk/setup-jsonnet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/generate.yaml

@@ -16,6 +16,6 @@ jobs:
     - uses: actions/[email protected]
       with:
         go-version-file: go.mod
-    - uses: zendesk/setup-jsonnet@v11
+    - uses: zendesk/setup-jsonnet@v12
     - run: go install github.com/brancz/gojsontoyaml@latest
     - run: make --always-make examples && git diff --exit-code