Bump update_engine version to 8 am: 39a6a4cb3b am: 1038608263

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1995530

Change-Id: Ifd56f7e0e3f62f53cb205f2ef8563db2b91bd1b6
diff --git a/update_engine.conf b/update_engine.conf
index b6ca3c4..2d3a655 100644
--- a/update_engine.conf
+++ b/update_engine.conf
@@ -1,2 +1,2 @@
 PAYLOAD_MAJOR_VERSION=2
-PAYLOAD_MINOR_VERSION=7
+PAYLOAD_MINOR_VERSION=8