Update commons to 2.1.15

Author: yuanzhou

src/requirements.txt

@@ -17,7 +17,7 @@ PyYAML==5.4.1
 # Use the branch name of commons from github for testing new changes made in commons from different branch
 # Default is main branch specified in docker-compose.development.yml if not set
 # git+https://github.com/hubmapconsortium/commons.git@${COMMONS_BRANCH}#egg=hubmap-commons
-hubmap-commons==2.1.12
+hubmap-commons==2.1.15
 
 # For unit test
 nose2==0.10.0