ci: more powerful local mac runners

Author: daquinteroflex

.github/workflows/tidy3d-extras-python-client-tests-integration.yml

@@ -56,7 +56,7 @@ jobs:
             runs-on: ubuntu-latest
             python-version: '3.10'
           - name: macos-arm64
-            runs-on: macos-latest
+            runs-on: mac-flexcompute
             python-version: '3.10'
           - name: windows-x64-3.10
             runs-on: windows-latest
@@ -190,10 +190,10 @@ jobs:
             runs-on: ubuntu-latest
             python-version: '3.13'
           - name: macos-arm64-3.10
-            runs-on: macos-latest
+            runs-on: mac-flexcompute
             python-version: '3.10'
           - name: macos-arm64-3.13
-            runs-on: macos-latest
+            runs-on: mac-flexcompute
             python-version: '3.13'
           - name: windows-x64-3.10
             runs-on: windows-latest