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](jetty/jetty.project@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](jetty/jetty.project@jetty-9.4.41.v20210516...jetty-9.4.42.v20210604)

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

Updates `jetty-jspc-maven-plugin` from 9.4.41.v20210516 to 9.4.42.v20210604
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@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:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-jspc-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -512,7 +512,7 @@
         <httpmime.version>4.5.13</httpmime.version>
         <intellij.version>5.0</intellij.version>
         <jaxbri.version>2.3.4</jaxbri.version>
-        <jetty.version>9.4.41.v20210516</jetty.version>
+        <jetty.version>9.4.42.v20210604</jetty.version>
         <jibx.version>1.3.3</jibx.version>
         <log4j2.version>2.14.1</log4j2.version>
         <maven.archiver.version>3.5.1</maven.archiver.version>