Fix `.github/issue_template.md`

[gjenkins8]

github is reporting that Helm is using an old issue template workflow:

Figure out what changes are needed for https://github.com/helm/helm/blob/main/.github/issue_template.md and update to this new workflow.

docs:
https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/about-issue-and-pull-request-templates

[Bhargavkonidena]

Hi @gjenkins8, I would like to contribute to this issue and ready with PR. Please assign this to me and review it.

[Bhargavkonidena]

@gjenkins8 can you please review this PR
#30912