Use .yaml extension in change-admin-password-hook template

[LuisPiedra]

All other YAML files in templates folder use .yaml extension and change-admin-password-hook.yml is the only one using .yml, which it is against Helm best practices (https://helm.sh/docs/chart_best_practices/templates/#structure-of-templates). Although Helm still accepts .yml extension, some other tools can be picky about that and ignore those files.

Please ensure your pull request adheres to the following guidelines:

• explain your motives to contribute this change: what problem you are trying to fix, what improvement you are trying to make
• Document your Changes in the CHANGELOG.md file of the respected chart as well as the Chart.yaml

[davividal]

Hey @LuisPiedra.

Nice catch, thank you!
Can you please apply this in the sonarqube-dce chart and rebase your branch against master?