Bump GitHub actions/stale from 7 to 8

Bumps actions/stale from 7 to 8.
Release notes
Sourced from actions/stale's releases.

v8.0.0

⚠️ This version contains breaking changes ⚠️

What's Changed

• New option labels-to-remove-when-stale enables users to specify list of coma delimited labels that will be removed when the issue or PR becomes stale by {{@​panticmilos}} actions/stale#770
• Skip deleting the branch in the upstream of a forked repo by {{@​dsame}} actions/stale#913
• abort the build on the error by {{@​dsame}} in actions/stale#935

Breaking Changes

• In this release we prevent scenarios when the build is not interrupted on some exceptions, which led to successful builds when they are supposed to fail

Example

name: 'Remove labels when the issue or PR becomes stale'on: schedule:

• cron: '30 1 * * *'permissions:pull-request: writejobs:stale:runs-on: ubuntu-lateststeps:
• uses: actions/stale@v8with:labels-to-remove-when-stale: 'label1,label2'