Update team reviewers (#1260)

Fixes #1259.

Author: pkwarren

.github/workflows/fetch.yaml

@@ -50,7 +50,7 @@ jobs:
           delete-branch: true
           title: "Found new managed modules references"
           body: ""
-          team-reviewers: bufbuild/core-team
+          team-reviewers: bufbuild/bsr-team
           token: ${{ steps.generate_token.outputs.token }}
           author: ${{ steps.generate_token.outputs.app-slug }}[bot] <${{ steps.generate_token.outputs.app-slug }}[bot]@users.noreply.github.com>
           committer: ${{ steps.generate_token.outputs.app-slug }}[bot] <${{ steps.generate_token.outputs.app-slug }}[bot]@users.noreply.github.com>