Bump jetty-server from 9.4.30.v20200611 to 9.4.38.v20210224

Bumps [jetty-server](https://github.com/eclipse/jetty.project) from 9.4.30.v20200611 to 9.4.38.v20210224.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.30.v20200611...jetty-9.4.38.v20210224)

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

pom.xml

@@ -9,7 +9,7 @@
       <dependency>
          <groupId>org.eclipse.jetty</groupId>
          <artifactId>jetty-server</artifactId>
-         <version>9.4.30.v20200611</version>
+         <version>9.4.38.v20210224</version>
       </dependency>
       <!-- https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-servlets -->
       <dependency>