reverting bad change in previous commit to use wrong jdk version

jaxrs-tck/pom.xml

diff --git a/jaxrs-tck/pom.xml b/jaxrs-tck/pom.xml
index 1b079b4..b01597a 100644
--- a/jaxrs-tck/pom.xml
+++ b/jaxrs-tck/pom.xml
@@ -30,8 +30,8 @@
     <url>https://github.com/eclipse-ee4j/jaxrs-api</url>
 
     <properties>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
         <junit.jupiter.version>[5.7.2, 5.8-A00)</junit.jupiter.version>
     </properties>