Bump jetty.version from 12.0.16 to 12.0.18

Bumps `jetty.version` from 12.0.16 to 12.0.18.

Updates `org.eclipse.jetty:jetty-bom` from 12.0.16 to 12.0.18
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-12.0.16...jetty-12.0.18)

Updates `org.eclipse.jetty.ee10:jetty-ee10-bom` from 12.0.16 to 12.0.18
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-12.0.16...jetty-12.0.18)

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

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

Author: dependabot[bot]

environments/servlet/pom.xml

@@ -26,7 +26,7 @@
 
     <properties>
         <tomcat.version>11.0.5</tomcat.version>
-        <jetty.version>12.0.16</jetty.version>
+        <jetty.version>12.0.18</jetty.version>
         <websockets.api>2.2.0</websockets.api>
         <undertow.version>2.3.18.Final</undertow.version>
     </properties>