Remove missing import

Author: mmubd

instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/internal/WebClientHttpAttributesGetter.java

@@ -8,7 +8,6 @@
 import static java.util.Collections.emptyList;
 
 import io.opentelemetry.instrumentation.api.incubator.semconv.http.HttpClientExperimentalAttributesGetter;
-import io.opentelemetry.instrumentation.api.semconv.http.HttpClientAttributesGetter;
 import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;