Update PR assignees (#2459)

Author: pkwarren

.github/automatic-workflow-issue-template.md

@@ -1,6 +1,6 @@
 ---
 title: Unexpected {{ workflow }} failure
-assignees: mfridman, pkwarren, stefanvanburen
+assignees: mfridman, oliversun9, pkwarren
 labels: bug
 ---
 

.github/workflows/fetch_versions.yml

@@ -72,7 +72,7 @@ jobs:
           delete-branch: true
           title: ${{ steps.fetch_versions.outputs.pr_title }}
           body: ${{ steps.fetch_versions.outputs.pr_body }}
-          assignees: mfridman, pkwarren, stefanvanburen
+          assignees: mfridman, oliversun9, pkwarren
           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>