build(deps): Bump 9elements/firmware-action

Bumps the github group with 1 update in the / directory: [9elements/firmware-action](https://github.com/9elements/firmware-action).


Updates `9elements/firmware-action` from 0.2.1 to 0.4.0
- [Release notes](https://github.com/9elements/firmware-action/releases)
- [Changelog](https://github.com/9elements/firmware-action/blob/main/CHANGELOG.md)
- [Commits](9elements/firmware-action@v0.2.1...v0.4.0)

---
updated-dependencies:
- dependency-name: 9elements/firmware-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github
...

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

.github/workflows/example.yml

@@ -24,7 +24,7 @@ jobs:
           go-version: stable
 
       - name: firmware-action
-        uses: 9elements/firmware-action@v0.2.1
+        uses: 9elements/firmware-action@v0.4.0
         with:
           config: 'firmware-action.json'
           target: 'coreboot-example'