Bump org.eclipse.jetty:jetty-servlet from 11.0.19 to 11.0.20

Bumps org.eclipse.jetty:jetty-servlet from 11.0.19 to 11.0.20.

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-servlet
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -361,7 +361,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>11</java.version>
     <jclouds.version>2.5.0</jclouds.version>
-    <jetty.version>11.0.19</jetty.version>
+    <jetty.version>11.0.20</jetty.version>
     <slf4j.version>2.0.11</slf4j.version>
     <shade.prefix>${project.groupId}.shaded</shade.prefix>
     <surefire.version>3.0.0</surefire.version>