chore(deps): update rust crate downcast-rs to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
downcast-rs	dependencies	major	1.2 → 2.0

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Release Notes

marcianx/downcast-rs (downcast-rs)

v2.0.2

Changed

• Updated README.md to omit lines hidden in crate documentation.
• (Minor) Cargo.toml: Corrected license format and added categories.

v2.0.1

Compare Source

Change

• Updated how code conditioned on the sync flag is written in the crate
  documentation to work around a crates.io doc rendering
  bug.

v2.0.0

Compare Source

Added

• Gated the sync/Arc downcasting functionality behind a new sync feature
  that is enabled by default.
• Added a new DowncastSend trait to support downcasting to Box<Any + Send>
  and made DowncastSync extend this trait.
• Added downcasting support to Box<Any + Send + Sync> to DowncastSync.

Change

• Updated minimum supported rust version 1.56 to enforce the
  rustdoc::bare_urls lint (1.53) and switch to edition 2021 (1.56).

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[LNSD]

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