Fix stale job using non-existant ARC runner (#134863)

The ARC CI system has been shutdown so this job is currently using a runner that doesn't exist.

Fixes #ISSUE_NUMBER

Pull Request resolved: https://github.com/pytorch/pytorch/pull/134863
Approved by: https://github.com/ZainRizvi

.github/actionlint.yaml

@@ -3,8 +3,6 @@ self-hosted-runner:
     # GitHub hosted x86 Linux runners
     - linux.20_04.4x
     - linux.20_04.16x
-    # Repo-specific LF hosted ARC runners
-    - linux.large.arc
     # Organization-wide AWS Linux Runners
     - linux.large
     - linux.2xlarge

.github/workflows/stale.yml

@@ -21,7 +21,7 @@ on:
 jobs:
   stale:
     if: ${{ github.repository == 'pytorch/pytorch' }}
-    runs-on: linux.large.arc
+    runs-on: linux.large
     permissions:
       contents: read
       pull-requests: write