build(deps): bump helmfile/helmfile-action from 1.9.1 to 2.0.0

Bumps [helmfile/helmfile-action](https://github.com/helmfile/helmfile-action) from 1.9.1 to 2.0.0.
- [Release notes](https://github.com/helmfile/helmfile-action/releases)
- [Commits](helmfile/helmfile-action@v1.9.1...v2.0.0)

---
updated-dependencies:
- dependency-name: helmfile/helmfile-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/check-generated-values.yml

@@ -7,7 +7,7 @@ jobs:
       - name: Check out repository
         uses: actions/checkout@v4
       - name: Set up helmfile
-        uses: helmfile/helmfile-action@v1.9.1
+        uses: helmfile/helmfile-action@v2.0.0
       - name: Diff current values files against generated ones
         run: >
           set -x;