Upgrade to Netty 4.1.52.Final

Closes gh-23269

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -142,7 +142,7 @@
 		<mysql.version>8.0.21</mysql.version>
 		<nekohtml.version>1.9.22</nekohtml.version>
 		<neo4j-ogm.version>3.1.21</neo4j-ogm.version>
-		<netty.version>4.1.51.Final</netty.version>
+		<netty.version>4.1.52.Final</netty.version>
 		<netty-tcnative.version>2.0.34.Final</netty-tcnative.version>
 		<nio-multipart-parser.version>1.1.0</nio-multipart-parser.version>
 		<pooled-jms.version>1.0.6</pooled-jms.version>

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/reactive/server/AbstractReactiveWebServerFactoryTests.java

@@ -259,7 +259,11 @@ protected void testClientAuthFailure(Ssl sslConfiguration, ReactorClientHttpConn
 		Mono<String> result = client.post().uri("/test").contentType(MediaType.TEXT_PLAIN)
 				.body(BodyInserters.fromObject("Hello World")).exchange()
 				.flatMap((response) -> response.bodyToMono(String.class));
-		StepVerifier.create(result).expectError(SSLException.class).verify(Duration.ofSeconds(10));
+		StepVerifier.create(result).expectErrorSatisfies((exception) -> {
+			if (!(exception instanceof SSLException)) {
+				assertThat(exception).hasCauseInstanceOf(SSLException.class);
+			}
+		}).verify(Duration.ofSeconds(10));
 	}
 
 	protected WebClient.Builder getWebClient() {