fix: add back FindBugs JSR 305 dependency

Author: phoval

modules/openapi-generator/src/main/resources/Java/libraries/webclient/build.gradle.mustache

@@ -172,6 +172,7 @@ dependencies {
     {{#swagger2AnnotationLibrary}}
     implementation "io.swagger.core.v3:swagger-annotations:$swagger_annotations_version"
     {{/swagger2AnnotationLibrary}}
+    implementation "com.google.code.findbugs:jsr305:3.0.2"
     implementation "io.projectreactor:reactor-core:$reactor_version"
     implementation "org.springframework.boot:spring-boot-starter-webflux:$spring_boot_version"
     implementation "io.projectreactor.netty:reactor-netty-http:$reactor_netty_version"