Improvements for release issue's template (#3727)

* Query to get external contributors
* Remember to pull the changes locally

.github/ISSUE_TEMPLATE/release.md

@@ -31,7 +31,9 @@ labels: ["release"]
 - [ ] Ensure that all merged pull-requests referenced in the release notes are linked to the release milestone.
 - [ ] Ensure all pull-requests in the `k6-docs` repository, related to new or modified functionalities introduced by the new version have been created.
 - [ ] Ensure all PRs in the k6 repository, part of the current [milestone](https://github.com/grafana/k6/milestones), have been merged.
-- [ ] Open a PR with the release notes for the new version, and ask teams who might have contributed to the release (k6-browser, k6-ecosystem, k6-docs, k6-devrel teams, etc.) to contribute their notes and review the existing ones.
+- [ ] Open a PR with the release notes for the new version
+  - [ ] Ask teams who might have contributed to the release (k6-browser, k6-ecosystem, k6-docs, k6-devrel teams, etc.) to contribute their notes and review the existing ones.
+  - [ ] Remember to mention and thank [external contributors](https://github.com/search?q=user%3Agrafana+repo%3Ak6+milestone%3A%22v0.51.0%22+-author%3Amstoykov+-author%3Aoleiade+-author%3Ana--+-author%3Acodebien+-author%3Aolegbespalov+-author%3Aandrewslotin+-author%3Ajoanlopez+-author%3Aankur22+-author%3Ainancgumus+-author%3Aszkiba+-author%3Adependabot%5Bbot%5D&type=pullrequests). <-- Update the query with the correct milestone version.
 - [ ] Share the release notes PR with the k6 open-source teams. Request contributions from all affected teams (k6-browser, k6-chaos, k6-docs, k6-devrel, etc.) and any other stakeholders involved in the new release.
 - [ ] Open a separate pull-request for bumping [the k6 Go project's version](https://github.com/grafana/k6/blob/master/lib/consts/consts.go#L11).
 - [ ] Open a PR in the `DefinitelyTyped/DefinitelyTyped` repository, using the release branch created in the grafana/k6-DefinitelyTyped fork, to update the k6 type definitions for the new release.
@@ -51,6 +53,7 @@ labels: ["release"]
 
 - [ ] Merge the PR bumping [the k6 Go project's version](https://github.com/grafana/k6/blob/9fa50b2d1f259cdccff5cc7bc18a236d31c345ac/lib/consts/consts.go#L11).
 - [ ] Merge the release notes PR.
+- [ ] Pull locally the previously merged changes.
 - [ ] Create and push a new tag of the form `vX.Y.Z` using git: `git tag v0.5x.0 -m "v0.5x.0"`.
 
 #### Announcements