release: update `release-config.jsonc` and paths to GitHub issues templates
Created by: sashaostrikov
Changing release dates, captain info and fixing the paths to GH issues templates which were broken due to some handbook pages rearrangement.
Test plan
Hit this fixed URL and see that there is no 404 anymore: https://api.github.com/repos/sourcegraph/handbook/contents/content%2Fdepartments%2Fengineering%2Fdev%2Fprocess%2Freleases%2Fpatch_release_issue_template.md