6010090 Don't use 'flutter upgrade' on Cirrus (flutter/plugins#4213)

engine-flutter-autoroll · engine-flutter-autoroll · commit 165d1f64a4bd · 2021-08-04T13:46:13.000Z
diff --git a/bin/internal/flutter_plugins.version b/bin/internal/flutter_plugins.version
@@ -1 +1 @@
-498df33f7bd613e7f0dba16ebeff42ff98ee61c5
+60100908443fffee28df82735a9c4019cf549227
