Update Rust crate rhai to v1.21.0

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
rhai (source)	workspace.dependencies	minor	1.20.0 -> 1.21.0

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Release Notes

rhaiscript/rhai (rhai)

v1.21.0

Compare Source

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Bug fixes

• Fixed bug in raw strings (thanks @benatkin 944).
• get_fn_metadata_list function is marked volatile.
• no-std plus sync should now build correctly (thanks stargazing-dino 947).

New Features

• It is possible to create a function pointer (FnPtr) which binds to a native Rust function or closure via FnPtr::from_dn and FnPtr::from_dyn_fn. When called in script, the embedded function will be called (thanks @makspll 952).

Enhancements

• The methods call_fn, call_native_fn, call_fn_raw and call_native_fn_raw are added to EvalContext (thanks @rawhuul 954).
• A new internals function, Engine::collect_fn_metadata, is added to collect all functions metadata. This is to facilitate better error reporting for missing functions (thanks therealprof 945).

v1.20.1

Compare Source

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Bug fixes

• Fixed bug in raw strings with newlines (thanks @benatkin 940).

Enhancements

• If a string slice refers to the entire string, the slice is not cloned but returned as-is.

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