Bump jetty.version from 9.4.41.v20210516 to 9.4.42.v20210604

Bumps `jetty.version` from 9.4.41.v20210516 to 9.4.42.v20210604.

Updates `jetty-server` from 9.4.41.v20210516 to 9.4.42.v20210604
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.41.v20210516...jetty-9.4.42.v20210604)

Updates `jetty-webapp` from 9.4.41.v20210516 to 9.4.42.v20210604
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.41.v20210516...jetty-9.4.42.v20210604)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-webapp
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index aea15f8..c957e55 100644
--- a/pom.xml
+++ b/pom.xml
@@ -250,7 +250,7 @@
         <springws.version>3.1.1</springws.version>
         <exam.version>4.13.4</exam.version>
         <slf4j.version>1.7.30</slf4j.version>
-        <jetty.version>9.4.41.v20210516</jetty.version>
+        <jetty.version>9.4.42.v20210604</jetty.version>
         <log4j.version>2.14.1</log4j.version>
         <groovy.version>3.0.8</groovy.version>
         <jaxbri.version>2.3.4</jaxbri.version>