Bump armeria-bom from 1.20.3 to 1.21.0 (#5065)

* Bump armeria-bom from 1.20.3 to 1.21.0

Bumps [armeria-bom](https://github.com/line/armeria) from 1.20.3 to 1.21.0.
- [Release notes](https://github.com/line/armeria/releases)
- [Changelog](https://github.com/line/armeria/blob/master/.post-release-msg)
- [Commits](https://github.com/line/armeria/compare/armeria-1.20.3...armeria-1.21.0)

---
updated-dependencies:
- dependency-name: com.linecorp.armeria:armeria-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Fix PrometheusHttpServerTest

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jack Berg <jberg@newrelic.com>

dependencyManagement/build.gradle.kts

@@ -15,7 +15,7 @@ val DEPENDENCY_BOMS = listOf(
   "com.fasterxml.jackson:jackson-bom:2.14.1",
   "com.google.guava:guava-bom:31.1-jre",
   "com.google.protobuf:protobuf-bom:3.21.12",
-  "com.linecorp.armeria:armeria-bom:1.20.3",
+  "com.linecorp.armeria:armeria-bom:1.21.0",
   "com.squareup.okhttp3:okhttp-bom:4.10.0",
   "io.grpc:grpc-bom:1.51.1",
   "io.zipkin.brave:brave-bom:5.14.1",

exporters/prometheus/src/test/java/io/opentelemetry/exporter/prometheus/PrometheusHttpServerTest.java

@@ -10,8 +10,8 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.io.ByteStreams;
 import com.linecorp.armeria.client.WebClient;
-import com.linecorp.armeria.client.encoding.DecodingClient;
 import com.linecorp.armeria.common.AggregatedHttpResponse;
 import com.linecorp.armeria.common.HttpHeaderNames;
 import com.linecorp.armeria.common.HttpMethod;
@@ -27,7 +27,11 @@ import io.opentelemetry.sdk.metrics.internal.data.ImmutableMetricData;
 import io.opentelemetry.sdk.metrics.internal.data.ImmutableSumData;
 import io.opentelemetry.sdk.metrics.internal.export.MetricProducer;
 import io.opentelemetry.sdk.resources.Resource;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.Collections;
+import java.util.zip.GZIPInputStream;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
@@ -150,17 +154,19 @@ class PrometheusHttpServerTest {
   }
 
   @Test
-  void fetchPrometheusCompressed() {
+  void fetchPrometheusCompressed() throws IOException {
     WebClient client =
         WebClient.builder("http://localhost:" + prometheusServer.getAddress().getPort())
-            .decorator(DecodingClient.newDecorator())
+            .addHeader(HttpHeaderNames.ACCEPT_ENCODING, "gzip")
             .build();
     AggregatedHttpResponse response = client.get("/").aggregate().join();
     assertThat(response.status()).isEqualTo(HttpStatus.OK);
     assertThat(response.headers().get(HttpHeaderNames.CONTENT_TYPE))
         .isEqualTo("text/plain; version=0.0.4; charset=utf-8");
     assertThat(response.headers().get(HttpHeaderNames.CONTENT_ENCODING)).isEqualTo("gzip");
-    assertThat(response.contentUtf8())
+    GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(response.content().array()));
+    String content = new String(ByteStreams.toByteArray(gis), StandardCharsets.UTF_8);
+    assertThat(content)
         .isEqualTo(
             "# TYPE target info\n"
                 + "# HELP target Target metadata\n"