Downgrade Jakarta Servlet API to 6.0.0

The integration is compatible with any servlet API version so far.
This helps integration with older servlet containers increasing compatibility.

Signed-off-by: Karsten Schnitter <k.schnitter@sap.com>

Author: KarstenSchnitter

pom.xml

@@ -124,7 +124,7 @@
         <javadoc.plugin.version>3.12.0</javadoc.plugin.version>
         <gpg.plugin.version>3.2.8</gpg.plugin.version>
         <httpclient.version>4.5.14</httpclient.version>
-        <servlet.api.version>6.1.0</servlet.api.version>
+        <servlet.api.version>6.0.0</servlet.api.version>
         <jetty.version>11.0.26</jetty.version>
         <sonatype.plugin.version>0.9.0</sonatype.plugin.version>
     </properties>