tools/ci.sh: Don't run uasyncio_gather test on macOS.

The timing on macOS makes this test unreliable.

Signed-off-by: Damien George <damien@micropython.org>

tools/ci.sh

@@ -561,7 +561,7 @@ function ci_unix_macos_run_tests {
     # - OSX has poor time resolution and these uasyncio tests do not have correct output
     # - import_pkg7 has a problem with relative imports
     # - urandom_basic has a problem with getrandbits(0)
-    (cd tests && ./run-tests.py --exclude 'uasyncio_(basic|heaplock|lock|wait_task)' --exclude 'import_pkg7.py' --exclude 'urandom_basic.py')
+    (cd tests && ./run-tests.py --exclude 'uasyncio_(basic|gather|heaplock|lock|wait_task)' --exclude 'import_pkg7.py' --exclude 'urandom_basic.py')
 }
 
 function ci_unix_qemu_mips_setup {