Update Rust crate moka to v0.8.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
moka	dependencies	patch	=0.8.3 -> =0.8.4

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Release Notes

moka-rs/moka

v0.8.4

Compare Source

Fixed

• Fix the following issue by upgrading Quanta crate to v0.10.0 ([#​126][gh-pull-0126]):
  • Quanta v0.9.3 or older may not work correctly on some x86_64 machines where
    the Time Stamp Counter (TSC) is not synched across the processor cores.
    ([#​119][gh-issue-0119])
  • For more details about the issue, see [the relevant section][panic_in_quanta]
    of the README.

Added

• Add get_with_if method to the following caches ([#​123][gh-issue-0123]):
  • sync::Cache
  • sync::SegmentedCache
  • future::Cache

Changed

The followings are internal changes to improve memory safety in unsafe Rust usages
in Moka:

• Remove pointer-to-integer transmute by converting UnsafeWeakPointer from usize
  to *mut T. ([#​127][gh-pull-0127])
• Increase the num segments of the waiters hash table from 16 to 64
  ([#​129][gh-pull-0129]) to reduce the chance of the following issue occurring:
  • Segfaults under heavy workloads on a many-core machine. ([#​34][gh-issue-0034])

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