chore(ci): switch to newer macos-11{,-arm64}-gui distros COMPASS-8696

Author: addaleax

.evergreen.yml

@@ -110,13 +110,13 @@ buildvariants:
       - check
   - name: macos_x64_test
     display_name: 'macOS 11.00 x64'
-    run_on: macos-1100-gui
+    run_on: macos-11-gui
     tasks:
       - test
       - test_electron
   - name: macos_arm64_test
     display_name: 'macOS 11.00 arm64'
-    run_on: macos-1100-arm64-gui
+    run_on: macos-11-arm64-gui
     tasks:
       - test
       - test_electron