Replace `once_cell` with `std` equivalents

[FalkWoldmann]

Describe the feature

Since Rust 1.80, the functionality of once_cell can be replaced by equivalents from std, like https://doc.rust-lang.org/std/sync/struct.LazyLock.html.

Use Case

This reduces the amount of dependencies.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

A note for the community

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[ysaito1001]

Good suggestion, thank you for filing it!

[amogh-dambal]

I'd love to grab this one if it's available for the community.

[FalkWoldmann]

Very nice, but maybe smithy-lang/smithy-rs#4105 fixes this already!

[amogh-dambal]

Oh nice! Missed that PR on the Smithy repo.

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