Revert ahash version restriction. #1568

Revert ahash version restriction.

Usage Workflow file

16 warnings

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Test: examples/arrays_and_structs.rs#L8

unused imports: `Engine`, `EvalAltResult`

`rhai` (example "arrays_and_structs") generated 1 warning (run `cargo fix --example "arrays_and_structs"` to apply 1 suggestion)

`rhai` (test "debugging") generated 1 warning

`rhai` (test "types") generated 1 warning (run `cargo fix --test "types"` to apply 1 suggestion)

Test: examples/custom_types_and_methods.rs#L8

unused imports: `CustomType`, `Engine`, `EvalAltResult`, `TypeBuilder`

`rhai` (example "custom_types_and_methods") generated 1 warning (run `cargo fix --example "custom_types_and_methods"` to apply 1 suggestion)

Test: tests/closures.rs#L2

unused imports: `Dynamic`, `ParseErrorType`, `Scope`

Test: tests/closures.rs#L5

unused import: `std::mem::take`

Test: tests/closures.rs#L320

type alias `TestStruct` is never used

`rhai` (test "closures") generated 3 warnings (run `cargo fix --test "closures"` to apply 2 suggestions)

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/