Fix Dynamic hashing. #1523

Fix Dynamic hashing.

Usage Workflow file

15 warnings

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: src/tokenizer.rs#L1594

unused variable: `has_period`

Test: src/tokenizer.rs#L1595

unused variable: `has_e`

Test: src/tokenizer.rs#L1594

variable does not need to be mutable

Test: src/tokenizer.rs#L1595

variable does not need to be mutable

Test: src/types/fn_ptr.rs#L27

field `environ` is never read

`rhai` (lib test) generated 5 warnings (5 duplicates)

Test: tests/math.rs#L1

unused import: `EvalAltResult`

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

Test: examples/pause_and_resume.rs#L11

unused import: `std::sync::Mutex`

`rhai` (example "pause_and_resume") generated 2 warnings (run `cargo fix --example "pause_and_resume"` to apply 2 suggestions)

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