Upgrade NullAway 0.12.11 -> 0.12.12 (#1957)

See:
- https://github.com/uber/NullAway/blob/master/CHANGELOG.md
- https://github.com/uber/NullAway/releases/tag/v0.12.12
- uber/NullAway@v0.12.11...v0.12.12

Author: Picnic-DevPla-Bot

pom.xml

@@ -353,7 +353,7 @@
             <dependency>
                 <groupId>com.uber.nullaway</groupId>
                 <artifactId>nullaway</artifactId>
-                <version>0.12.11</version>
+                <version>0.12.12</version>
             </dependency>
             <dependency>
                 <groupId>io.micrometer</groupId>