Bump gradle-nullaway-plugin from 1.3.0 to 1.4.0 (#543)

Bumps gradle-nullaway-plugin from 1.3.0 to 1.4.0.


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buildSrc/build.gradle.kts

@@ -14,7 +14,7 @@ dependencies {
   // When updating, update above in plugins too
   implementation("com.diffplug.spotless:spotless-plugin-gradle:6.9.0")
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:2.0.2")
-  implementation("net.ltgt.gradle:gradle-nullaway-plugin:1.3.0")
+  implementation("net.ltgt.gradle:gradle-nullaway-plugin:1.4.0")
 }
 
 spotless {