Bump net.ltgt.gradle:gradle-nullaway-plugin from 2.1.0 to 2.2.0

Bumps [net.ltgt.gradle:gradle-nullaway-plugin](https://github.com/tbroyer/gradle-nullaway-plugin) from 2.1.0 to 2.2.0.
- [Release notes](https://github.com/tbroyer/gradle-nullaway-plugin/releases)
- [Commits](tbroyer/gradle-nullaway-plugin@v2.1.0...v2.2.0)

---
updated-dependencies:
- dependency-name: net.ltgt.gradle:gradle-nullaway-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

buildSrc/build.gradle.kts

@@ -36,7 +36,7 @@ dependencies {
   implementation("io.opentelemetry.instrumentation:gradle-plugins:2.11.0-alpha")
 
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:4.1.0")
-  implementation("net.ltgt.gradle:gradle-nullaway-plugin:2.1.0")
+  implementation("net.ltgt.gradle:gradle-nullaway-plugin:2.2.0")
 
   implementation("gradle.plugin.io.morethan.jmhreport:gradle-jmh-report:0.9.6")
   implementation("me.champeau.jmh:jmh-gradle-plugin:0.7.2")