Roll Fuchsia Mac SDK from _XAgOfwCo... to -xKcveik7... (#29973)

diff --git a/DEPS b/DEPS
index 9a38ef1..bffc214 100644
--- a/DEPS
+++ b/DEPS
@@ -606,7 +606,7 @@
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': '_XAgOfwCobNsa3cVYxH59YDLgPu4Xi7Q-ZgxUfI8I2EC'
+        'version': '-xKcveik7Z7nYYc4GEMDBdk8jCfzItAnZB6M2Vb0R9YC'
        }
      ],
      'condition': 'host_os == "mac"',