Use release drafter 7 (#789)

Adapt to release drafter v7 configuration change

Release drafter v7 dropped support for `_extends: .github` in the
configuration.  It either needs to be removed or replaced with a more
complete specification like:

`_extends: github:jenkinsci/.github:/.github/release-drafter.yml`

Testing done

* None.  Has worked well in many repositories, not expecting any issues in this repository

Author: MarkEWaite

.github/release-drafter.yml

@@ -1,5 +1,5 @@
 # https://github.com/jenkinsci/.github/blob/master/.github/release-drafter.adoc
-_extends: .github
+_extends: github:jenkinsci/.github:/.github/release-drafter.yml
 version-template: $MAJOR.$MINOR.$PATCH
 tag-template: v$NEXT_PATCH_VERSION
 name-template: v$NEXT_PATCH_VERSION

.github/workflows/release-drafter.yml

@@ -12,6 +12,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # Drafts your next Release notes as Pull Requests are merged into the default branch
-      - uses: release-drafter/release-drafter@v6
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - uses: release-drafter/release-drafter@v7
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}