Roll Flutter (stable) from 135454af3247 to b06b8b271095 (2551 revisions) (#7018)

flutter/flutter@135454a...b06b8b2
diff --git a/.ci/flutter_stable.version b/.ci/flutter_stable.version
index f393339..45363bc 100644
--- a/.ci/flutter_stable.version
+++ b/.ci/flutter_stable.version
@@ -1 +1 @@
-135454af32477f815a7525073027a3ff9eff1bfd
+b06b8b2710955028a6b562f5aa6fe62941d6febf