2608f2e removing firefox tests from cirrus. since yesterday they are running on LUCI. (flutter/engine#18790)

engine-flutter-autoroll · engine-flutter-autoroll · commit 4465ee622c9a · 2020-06-04T17:12:44.000Z
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
@@ -1 +1 @@
-f1d37398f4d19aab2cb29239ecfe36ec0713885c
+2608f2ee9f54966b1083034c7ce60b0c3250cab1
