Update guava to 28.1-jre

[scala-steward]

Updates com.google.guava:guava from 28.0-jre to 28.1-jre.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.google.guava", artifactId = "guava" } ]