* Action update:
- Bump all dependencies
- Rewrite `getLatestHelmVersion()` function without graphql
* Bump stableHelmVersion
* Update readme and action.yaml
* Revert and rewrite with @octokit/action
* Add latest to integration test
* Bump action's versions
* Set github.token as default input
* Replace deprecated jest methods
* Add prettier to dev dependencies, fix prettier issues