Bump net.ltgt.gradle:gradle-nullaway-plugin from 1.5.0 to 1.6.0 (#8495)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

conventions/build.gradle.kts

@@ -65,7 +65,7 @@ dependencies {
   implementation("gradle.plugin.io.morethan.jmhreport:gradle-jmh-report:0.9.0")
   implementation("me.champeau.jmh:jmh-gradle-plugin:0.7.1")
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:3.1.0")
-  implementation("net.ltgt.gradle:gradle-nullaway-plugin:1.5.0")
+  implementation("net.ltgt.gradle:gradle-nullaway-plugin:1.6.0")
   implementation("me.champeau.gradle:japicmp-gradle-plugin:0.4.1")
 
   testImplementation(enforcedPlatform("org.junit:junit-bom:5.9.3"))