Adjust PR template: remove the checklist to "share in project-tech-infra" channel

[Mariatta]

…fra" channel

I've added the GitHub App integration in Slack where PRs opened in this repo will be automatically posted to the project-tech-infra Slack channel. So I think it is not necessary to instruct the contributor to do so. One less thing for them to do.

PyLadies Pull Request

Is this pull requesting adding a PyLadies chapter website?

• [ ] Yes
• [x] No

Is this pull request updating a PyLadies website?

• [ ] Yes
• [x] No

Pull Request Checklist

• [x] Fill out all sections above

/cc @pyladies/tech-and-infra-admins