sentry-ruby 4.8.0 on Ruby Gems

Support exception frame's local variable capturing
- #1580
- #1589
Example:

To enable this feature, you need to set config.capture_exception_frame_locals to true:
```
Sentry.init do |config|
  config.capture_exception_frame_locals = true # default is false
end
```
This feature should only introduce negligible performance overhead in most Ruby applications. But if you notice obvious performance regression, please file an issue and we'll investigate it.
Support ActiveStorage spans in tracing events #1588
Support Sidekiq Tags in Sentry #1596
Add Client Reports to collect dropped event statistics #1604
This feature reports statistics about dropped events along with sent events (so no additional requests made). It'll help Sentry improve SDKs and features like rate-limiting. This information will not be visible to users at the moment, but we're planning to add this information to user-facing UI.
If you don't want to send this data, you can opt-out by setting config.send_client_reports = false.

Connect Sidekiq's transaction with its parent when possible #1590
- Fixes #1586
Use nil instead of false to disable callable settings #1594
Avoid duplicated sampling on Transaction events #1601
Remove verbose data from #inspect result #1602

Move Sentry::Rails::CaptureExceptions before ActionDispatch::ShowExceptions #1608
Refactor Sentry::Configuration #1595
Tracing subscribers should be multi-event based #1587