Upgrade to Spring Pulsar 1.2.8.

Comment From: tar455

Hi @snicoll , I'd like to contribute to this issue by upgrading Spring Pulsar to version 1.2.8 . Could you please guide me on any specific steps or areas I should focus on for this update? Let me know if I can take this up. Thanks!

Comment From: snicoll

@tar455 thanks for the offer, but dependency upgrades are not open for contributions. There's nothing to do, except flip a version number in the build, and we have a process in place to do that.