fix(deps): update dependency com.github.spotbugs:spotbugs-annotations to v4.7.3 (#1371)

Author: nedtwigg

gradle.properties

@@ -17,7 +17,7 @@ artifactIdGradle=spotless-plugin-gradle
 
 # Build requirements
 VER_JAVA=1.8
-VER_SPOTBUGS=4.7.2
+VER_SPOTBUGS=4.7.3
 VER_JSR_305=3.0.2
 
 # Dependencies provided by Spotless plugin