Update redisson proxy manager to support redisson 3.21.0

[koenpunt]

The synchronous command executor has been removed from Redisson in version 3.21.0.

[vladimir-bukhtoyarov]

Good, I will look tomorrow.

[koenpunt]

@vladimir-bukhtoyarov cool, I've already rebased the changes on the 8.3 branch

[vladimir-bukhtoyarov]

Released with version 8.3.0

[koenpunt]

Had to find out about the new group id because 8.3.0 isn't available on com.github.vladimir-bukhtoyarov; would it be an idea to release a final version update on the old group id which then deprecates the code and suggests changing the group?
This would really help people using dependabot to keep there dependencies up to date.

[vladimir-bukhtoyarov]

GroupId is "com.bucket4j". It was changed about 1 year ago. New groupId is mentioned on github project page.

would it be an idea to release a final version update on the old group id which then deprecates the code and suggests changing the group?

I am limited in time that I can afford to spend for this library, so I prefer to spend it carefully, mostly to new features and enhancements.

[koenpunt]

I understand.

But if someone doesn't visit the GitHub page they won't know. And gradle or maven doesn't know about this name change either, so it was just something to consider.