TEMPORARY: set database branch to lithium

remove this commit before merging

Author: mjohnson541

.github/workflows/CI.yml

@@ -46,7 +46,7 @@ concurrency:
 env:
   # if running on RMG-Py but requiring changes on an un-merged branch of RMG-database, replace
   # main with the name of the branch
-  RMG_DATABASE_BRANCH: main
+  RMG_DATABASE_BRANCH: lithium
 
 
 jobs: