Update dependency tslib to v2.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tslib (source)	2.7.0 -> 2.8.0

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Release Notes

Microsoft/tslib (tslib)

### [`v2.8.0`](https://redirect.github.com/microsoft/tslib/releases/tag/v2.8.0) [Compare Source](https://redirect.github.com/Microsoft/tslib/compare/v2.7.0...v2.8.0) #### What's Changed - Validate export structure of every entrypoint by [@​andrewbranch](https://redirect.github.com/andrewbranch) in [https://github.com/microsoft/tslib/pull/269](https://redirect.github.com/microsoft/tslib/pull/269) - Add rewriteRelativeImportExtension helper by [@​andrewbranch](https://redirect.github.com/andrewbranch) in [https://github.com/microsoft/tslib/pull/270](https://redirect.github.com/microsoft/tslib/pull/270) **Full Changelog**: https://github.com/microsoft/tslib/compare/v2.7.0...v2.8.0

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