Swift: move running to intel

The problems running on arm are concerning, but may be caused by not
building with the internal macOS toolchain. We'll do separate work
internally to investigate and possibly fix that.

In the meantime, we can keep testing on intel as is currently done in
main.

Author: redsun82

Diff for: .github/workflows/swift.yml

@@ -70,7 +70,7 @@ jobs:
   qltests-macos:
     if: ${{ github.repository_owner == 'github' && github.event_name == 'pull_request' }}
     needs: build-and-test-macos-intel
-    runs-on: macos-13-xlarge
+    runs-on: macos-13-large
     steps:
       - uses: actions/checkout@v4
       - uses: ./swift/actions/run-ql-tests
@@ -84,7 +84,7 @@ jobs:
   integration-tests-macos:
     if: ${{ github.repository_owner == 'github' && github.event_name == 'pull_request' }}
     needs: build-and-test-macos-intel
-    runs-on: macos-13-xlarge
+    runs-on: macos-13-large
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4