Version of `sentry` dependency is 2 years old, many releases behind

The `pingora-core` crate specifies the `0.26.0` version of `sentry`, and there have been many releases and updates to this crate over the last 2 years.

I mention this because I've been doing some memory profiling and it seems like when a request panics, Sentry does retrieve debugging information and submit to Sentry, but the memory is never deallocated. I am unsure if upgrading to the latest version of `sentry` will solve this issue, but there have been 24 releases of the `sentry` crate since `0.26.0`.