Roll external/effcee/ 2c97e5689..8ce15c424 (13 commits)

google/effcee@2c97e56...8ce15c4

Created with:
  roll-dep external/effcee

Author: GitHub Actions[bot]

DEPS

@@ -5,7 +5,7 @@ vars = {
 
   'abseil_revision': '2dd8036891687917ad5296281ef5c867c3538950',
 
-  'effcee_revision': '2c97e5689ed8d7ab6ae5820f884f03a601ae124b',
+  'effcee_revision': '8ce15c424e61a94ee27b5be0ec0ed036b158e6e3',
 
   'googletest_revision': '7da55820cc32dedd6c1b048f2d4e13fdde5e8237',