chore: Remove unused internal feature flag _all-features

[Pr0methean]

Partial fix for #605.

[gemini-code-assist]

Summary of Changes

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This pull request focuses on a minor cleanup task by removing an unused internal feature flag from the Cargo.toml file. This change simplifies the project's build configuration and contributes as a partial fix for issue #605.

Highlights

• Feature Flag Removal: The internal _all-features feature flag has been removed from Cargo.toml as it was unused and no longer necessary.

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[amazon-q-developer]

This PR correctly removes the unused _all-features internal feature flag from Cargo.toml. The change is clean and follows the Conventional Commits format. The removal doesn't impact any other features or functionality, making this a safe cleanup change that addresses part of issue #605.

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[gemini-code-assist]

Code Review

This pull request removes the unused internal feature flag _all-features from Cargo.toml. This is a good cleanup, as the feature flag does not appear to be used anywhere in the provided code. The change is correct and improves the maintainability of the project. I have no further comments.