Update Rust crate test-case to v3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
test-case	dev-dependencies	major	2.2.2 -> 3.0.0

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Release Notes

frondeus/test-case

### [`v3.0.0`](https://togithub.com/frondeus/test-case/blob/HEAD/CHANGELOG.md#​300) [Compare Source](https://togithub.com/frondeus/test-case/compare/v2.2.2...v3.0.0) \[IMPORTANT] Starting with 3.0 release we are changing `test-case` MSRV policy to support only 3 latest stable releases. ##### Changes - Split out functional parts of `test-case-macros` crate into `test-case-core` for easy reuse by external libraries

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