Bump gradle-nullaway-plugin from 1.4.0 to 1.5.0 (open-telemetry#4925)

Bumps gradle-nullaway-plugin from 1.4.0 to 1.5.0.

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

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

buildSrc/build.gradle.kts

@@ -25,7 +25,7 @@ dependencies {
   implementation("me.champeau.gradle:japicmp-gradle-plugin:0.4.1")
   implementation("me.champeau.jmh:jmh-gradle-plugin:0.6.8")
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:3.0.1")
-  implementation("net.ltgt.gradle:gradle-nullaway-plugin:1.4.0")
+  implementation("net.ltgt.gradle:gradle-nullaway-plugin:1.5.0")
   implementation("ru.vyarus:gradle-animalsniffer-plugin:1.6.0")
 }