Require Java 11 in stream Java client projects

References rabbitmq/rabbitmq-stream-java-client#663

Author: acogoluegnes

deps/rabbitmq_stream/test/rabbit_stream_SUITE_data/pom.xml

@@ -83,8 +83,7 @@
  <artifactId>maven-compiler-plugin</artifactId>
  <version>${maven.compiler.plugin.version}</version>
  <configuration>
- <source>1.8</source>
- <target>1.8</target>
+ <release>11</release>
  <compilerArgs>
  <arg>-Xlint:deprecation</arg>
  <arg>-Xlint:unchecked</arg>

deps/rabbitmq_stream_management/test/http_SUITE_data/pom.xml

@@ -99,8 +99,7 @@
  <artifactId>maven-compiler-plugin</artifactId>
  <version>${maven.compiler.plugin.version}</version>
  <configuration>
- <source>1.8</source>
- <target>1.8</target>
+ <release>11</release>
  <compilerArgs>
  <arg>-Xlint:deprecation</arg>
  <arg>-Xlint:unchecked</arg>