Update openr manifest to use main

Summary: - Repo has a main branch now and not master

Reviewed By: xiangxu1121

Differential Revision: D31313971

fbshipit-source-id: 70d151e8a8632e296f25baf07ff9ac8348da7497

build/fbcode_builder/manifests/openr

@@ -6,6 +6,7 @@ shipit_fbcode_builder = true
 
 [git]
 repo_url = https://github.com/facebook/openr.git
+rev = main
 
 [build.os=linux]
 builder = cmake