Bump xstream from 1.4.17 to 1.4.18
Bump xstream from 1.4.17 to 1.4.18

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.17 to 1.4.18.
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

---
updated-dependencies:
- dependency-name: com.thoughtworks.xstream:xstream
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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