Update Engine revision to ec975089acb540fc60752606a3d3ba809dd1528b for stable release 3.7.9 (#123639)

diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 210e12b..9512506 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-9aa7816315095c86410527932918c718cb35e7d6
+ec975089acb540fc60752606a3d3ba809dd1528b