Update dependency io.projectreactor:reactor-core to v3.6.11

Author: renovate[bot]

reactive-logstash-logging-spring-boot-starter/pom.xml

@@ -96,7 +96,7 @@
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-core</artifactId>
-            <version>3.6.10</version>
+            <version>3.6.11</version>
             <scope>provided</scope>
         </dependency>
         <dependency>