build(deps): bump @docker/actions-toolkit from 0.16.1 to 0.21.0

Bumps [@docker/actions-toolkit](https://github.com/docker/actions-toolkit) from 0.16.1 to 0.21.0.
- [Release notes](https://github.com/docker/actions-toolkit/releases)
- [Commits](https://github.com/docker/actions-toolkit/compare/v0.16.1...v0.21.0)

---
updated-dependencies:
- dependency-name: "@docker/actions-toolkit"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -26,7 +26,7 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@actions/core": "^1.10.1",
-    "@docker/actions-toolkit": "^0.16.1"
+    "@docker/actions-toolkit": "^0.21.0"
   },
   "devDependencies": {
     "@types/node": "^20.5.9",