Upgrade to Httpcore 4.4.8

Closes gh-10581

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

@@ -69,7 +69,7 @@
 		<htmlunit.version>2.27</htmlunit.version>
 		<httpasyncclient.version>4.1.3</httpasyncclient.version>
 		<httpclient.version>4.5.3</httpclient.version>
-		<httpcore.version>4.4.7</httpcore.version>
+		<httpcore.version>4.4.8</httpcore.version>
 		<infinispan.version>9.1.1.Final</infinispan.version>
 		<influxdb-java.version>2.7</influxdb-java.version>
 		<jackson.version>2.9.1</jackson.version>