Bump jetty-servlet from 11.0.14 to 11.0.15

Bumps [jetty-servlet](https://github.com/eclipse/jetty.project) from 11.0.14 to 11.0.15.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-11.0.14...jetty-11.0.15)

---
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

@@ -470,7 +470,7 @@
     <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-servlet</artifactId>
-      <version>11.0.14</version>
+      <version>11.0.15</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>