switch to x-large arm64

Author: Stebalien

.github/workflows/ci.yml

@@ -81,7 +81,7 @@ jobs:
     runs-on: ${{ matrix.runner }}
     strategy:
       matrix:
-        runner: [["self-hosted", "linux", "x64", "4xlarge"], ["self-hosted", "linux", "arm64", "4xlarge"], 'macos-latest']
+        runner: [["self-hosted", "linux", "x64", "4xlarge"], ["self-hosted", "linux", "arm64", "xlarge"], 'macos-latest']
       fail-fast: false
     steps:
       - run: echo "Running on $RUNNER_OS $RUNNER_ARCH"