Upgrade NullAway to 0.12.7 (#69)

Author: gtoison

pom.xml

@@ -42,7 +42,7 @@
 		<sonar-orchestrator.version>5.6.0.2578</sonar-orchestrator.version>
 
 		<errorprone.version>2.39.0</errorprone.version>
-		<nullaway.version>0.12.6</nullaway.version>
+		<nullaway.version>0.12.7</nullaway.version>
 		<errorprone.slf4j.version>0.1.28</errorprone.slf4j.version>
 		<picnic.errorprone.support.version>0.23.0</picnic.errorprone.support.version>