Update dependency tslib to v2.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tslib (source)	2.8.0 -> 2.8.1

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Release Notes

Microsoft/tslib (tslib)

### [`v2.8.1`](https://redirect.github.com/Microsoft/tslib/compare/v2.8.0...d72d6f70b36286bc3f94a3dda1e64dcb568b1370) [Compare Source](https://redirect.github.com/Microsoft/tslib/compare/v2.8.0...v2.8.1)

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