HADOOP-17655. Upgrade Jetty to 9.4.40. (#2947)

Reviewed-by: Wei-Chiu Chuang <weichiu@apache.org>
(cherry picked from commit 0b04c9694da86941e04a480d55913701f9fe514d)

hadoop-project/pom.xml

@@ -37,7 +37,7 @@
     <!--Whether to proceed to next module if any test failures exist-->
     <ignoreTestFailure>true</ignoreTestFailure>
     <maven.test.redirectTestOutputToFile>true</maven.test.redirectTestOutputToFile>
-    <jetty.version>9.4.39.v20210325</jetty.version>
+    <jetty.version>9.4.40.v20210413</jetty.version>
     <test.exclude>_</test.exclude>
     <test.exclude.pattern>_</test.exclude.pattern>