chore(deps-dev): bump @podman-desktop/api from 1.20.2 to 1.21.0

Bumps [@podman-desktop/api](https://github.com/podman-desktop/podman-desktop) from 1.20.2 to 1.21.0.
- [Release notes](https://github.com/podman-desktop/podman-desktop/releases)
- [Changelog](https://github.com/podman-desktop/podman-desktop/blob/main/RELEASE.md)
- [Commits](podman-desktop/podman-desktop@v1.20.2...v1.21.0)

---
updated-dependencies:
- dependency-name: "@podman-desktop/api"
  dependency-version: 1.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packages/backend/package.json

@@ -106,7 +106,7 @@
     "watch": "vite --mode development build -w"
   },
   "devDependencies": {
-    "@podman-desktop/api": "1.20.2",
+    "@podman-desktop/api": "1.21.0",
     "@types/node": "^22",
     "@typescript-eslint/eslint-plugin": "^8.39.1",
     "@typescript-eslint/parser": "^8.32.0",