`install-only` does not work in v8

### Welcome - [x] Yes, I understand that the GitHub action repository is not the repository of golangci-lint itself. - [x] Yes, I've searched similar issues on GitHub and didn't find any. - [x] Yes, I've included all information below (version, config, etc). ### Description of the problem I followed the example from the documentation for the `install-only` option directly. However, it does not work with v8. When I switched to v9, it worked as expected. With v8, a warning is given: ``` Unexpected input(s) 'install-only', valid inputs are ['version', 'install-mode', 'working-directory', 'github-token', 'verify', 'only-new-issues', 'skip-cache', 'skip-save-cache', 'problem-matchers', 'args', 'cache-invalidation-interval'] ``` It then proceeds to run the checks anyway. ### Version of golangci-lint v2.6.2 ### Version of the GitHub Action v8 ### Workflow file ```yml name: Continuous Integration on: workflow_dispatch: {} pull_request: branches: - main push: branches: - main jobs: test: name: Quality Audit steps: - uses: actions/checkout@v4 - name: Set up Go uses: actions/setup-go@v4 with: go-version: 'stable' check-latest: true - name: Install golangci-lint uses: golangci/golangci-lint-action@v8 with: install-only: true - name: Run CI Audit run: make audit-ci ``` ### Golangci-lint configuration Not using a configuration file (default behavior) ### Go version 1.25 ### Code example or link to a public repository No, thank you. The project is not open source.