chore: upgrade guava from 29.0 to 30.1.1
chore: upgrade guava from 29.0 to 30.1.1

... in order to fix CVE-2020-8908.
See also: https://github.com/advisories/GHSA-5mg8-w23w-74h3

marccarre/xml-stream-filter,marccarre/xml-stream-filter