Update dependency helm/chart-testing to v3.12.0 (#3014)

| datasource  | package            | from    | to      |
| ----------- | ------------------ | ------- | ------- |
| github-tags | helm/chart-testing | v3.11.0 | v3.12.0 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/lint.yml

@@ -114,7 +114,7 @@ jobs:
       - name: Set up chart-testing
         uses: helm/chart-testing-action@e6669bcd63d7cb57cb4380c33043eebe5d111992 # v2.6.1
         with:
-          version: 3.11.0 # renovate: datasource=github-tags depName=helm/chart-testing
+          version: 3.12.0 # renovate: datasource=github-tags depName=helm/chart-testing
 
       - name: Run chart-testing
         run: ct lint --print-config --config .ct.yaml