Repo caravel-lite uses main and not master

Makefile

diff --git a/Makefile b/Makefile
index f576dda..6bd9566 100644
--- a/Makefile
+++ b/Makefile
@@ -101,7 +101,7 @@
 	@git submodule update --init
 else
 	cd $(CARAVEL_ROOT)/ && \
-		git checkout master && \
+		git checkout $(CARAVEL_COMMIT) && \
 		git pull
 endif