Upgrade action to use node20 (#121)

* 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

.github/workflows/defaultLabels.yml

@@ -13,7 +13,7 @@ jobs:
 
       # Steps represent a sequence of tasks that will be executed as part of the job
       steps:
-         - uses: actions/stale@v6
+         - uses: actions/stale@v9
            name: Setting issue as idle
            with:
               repo-token: ${{ secrets.GITHUB_TOKEN }}
@@ -24,7 +24,7 @@ jobs:
               operations-per-run: 100
               exempt-issue-labels: 'backlog'
 
-         - uses: actions/stale@v6
+         - uses: actions/stale@v9
            name: Setting PR as idle
            with:
               repo-token: ${{ secrets.GITHUB_TOKEN }}