Update jetty9.version to v9.4.44.v20210927 (release/4.2.x) (#2174)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

pom.xml

@@ -53,7 +53,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
         <jackson.version>2.12.3</jackson.version>
-        <jetty9.version>9.4.43.v20210629</jetty9.version>
+        <jetty9.version>9.4.44.v20210927</jetty9.version>
         <jetty10.version>10.0.6</jetty10.version>
         <jetty11.version>11.0.6</jetty11.version>
         <slf4j.version>1.7.32</slf4j.version>