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

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What's Changed

• Validate export structure of every entrypoint by @​andrewbranch in https://github.com/microsoft/tslib/pull/269
• Add rewriteRelativeImportExtension helper by @​andrewbranch in https://github.com/microsoft/tslib/pull/270

Full Changelog: https://github.com/microsoft/tslib/compare/v2.7.0...v2.8.0

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