build(deps): declare jackson-annotations for generated test fixtures

jackson-databind-nullable 0.2.10+ marks jackson-databind as provided, so it no
longer brings jackson-annotations in transitively. The generated OpenAPI models
in the test fixtures need it on the compile classpath.

Author: pboos

test/openapi-web/build.gradle

@@ -25,6 +25,7 @@ dependencies {
     // For openapi generated code
     testFixturesApi 'org.springframework.boot:spring-boot-starter-validation'
     testFixturesApi(libs.openapi.tools.jacksonDatabindNullable)
+    testFixturesApi 'com.fasterxml.jackson.core:jackson-annotations'
     testFixturesApi(libs.jakarta.validation.api)
     testFixturesApi(libs.swagger.annotations)
     testFixturesApi 'org.apache.tomcat.embed:tomcat-embed-core' // For jakarta.servlet.ServletContext

test/openapi-webflux/build.gradle

@@ -25,6 +25,7 @@ dependencies {
     // For openapi generated code
     testFixturesApi 'org.springframework.boot:spring-boot-starter-validation'
     testFixturesApi(libs.openapi.tools.jacksonDatabindNullable)
+    testFixturesApi 'com.fasterxml.jackson.core:jackson-annotations'
     testFixturesApi(libs.jakarta.validation.api)
     testFixturesApi(libs.swagger.annotations)
     testFixturesApi 'org.apache.tomcat.embed:tomcat-embed-core' // For jakarta.servlet.ServletContext