fix(pulsar): update pulsar -> 0.8.3

[thalesmg]

targeting release-51

Fixes https://emqx.atlassian.net/browse/EMQX-10229

See emqx/pulsar-client-erl#59

Fixes a case_clause error that could arise from race conditions.

Summary

🤖 Generated by Copilot at 3b2d4b6

Updated pulsar dependency to 0.8.3 in emqx_bridge_pulsar plugin. This improved the stability and efficiency of the plugin's communication with pulsar brokers.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[yanzhiemq]

Bug Fixes

• Fixed a case_clause error that could arise in race conditions in Pulsar Producer bridge.

[yanzhiemq]

修复

• 修复了Pulsar Producer 桥接中可能在竞态条件下引发的 case_clause 错误。