release: version 1.19.0

[WilliamBergamin]

This PR is a sanity check for a release

Category

• [ ] slack_bolt.App and/or its core components
• [ ] slack_bolt.async_app.AsyncApp and/or its core components
• [ ] Adapters in slack_bolt.adapter
• [ ] Document pages under /docs
• [x] Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.77%. Comparing base (2882708) to head (a46d14d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1091 +/- ## ======================================= Coverage 91.77% 91.77% ======================================= Files 186 186 Lines 6407 6407 ======================================= Hits 5880 5880 Misses 527 527 ```

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