test/core_deps.mk: Fix jquery branch name

Apparently it was renamed.

test/core_deps.mk

@@ -91,7 +91,7 @@ core-deps-build-js: init
 	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap-lib $v
 
 	$i "Add jquery to the list of build dependencies"
-	$t perl -ni.bak -e 'print;if ($$.==1) {print "BUILD_DEPS = jquery\ndep_jquery = git https://github.com/jquery/jquery master\n"}' $(APP)/Makefile
+	$t perl -ni.bak -e 'print;if ($$.==1) {print "BUILD_DEPS = jquery\ndep_jquery = git https://github.com/jquery/jquery main\n"}' $(APP)/Makefile
 
 	$i "Build the application"
 	$t $(MAKE) -C $(APP) $v