Bump jetty-server.version from 12.0.19 to 12.0.20

Bumps `jetty-server.version` from 12.0.19 to 12.0.20.

Updates `org.eclipse.jetty:jetty-server` from 12.0.19 to 12.0.20

Updates `org.eclipse.jetty.ee10:jetty-ee10-servlet` from 12.0.19 to 12.0.20

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-version: 12.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty.ee10:jetty-ee10-servlet
  dependency-version: 12.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

integration-tests/it-exporter/it-exporter-servlet-jetty-sample/pom.xml

@@ -16,7 +16,7 @@
     Jetty Sample for the Exporter Integration Test
   </description>
   <properties>
-    <jetty-server.version>12.0.19</jetty-server.version>
+    <jetty-server.version>12.0.20</jetty-server.version>
     <java.version>17</java.version>
   </properties>