Bump jetty-webapp from 9.4.48.v20220622 to 9.4.51.v20230217 (#78)

Bumps [jetty-webapp](https://github.com/eclipse/jetty.project) from 9.4.48.v20220622 to 9.4.51.v20230217.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.48.v20220622...jetty-9.4.51.v20230217)

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

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