Update dependency tslib to v2.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tslib (source)	2.6.0 -> 2.6.1

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Release Notes

Microsoft/tslib (tslib)

### [`v2.6.1`](https://togithub.com/microsoft/tslib/releases/tag/v2.6.1): tslib 2.6.1 [Compare Source](https://togithub.com/Microsoft/tslib/compare/2.6.0...v2.6.1) #### What's Changed - Allow functions as values in \__addDisposableResource by [@​rbuckton](https://togithub.com/rbuckton) in [https://github.com/microsoft/tslib/pull/215](https://togithub.com/microsoft/tslib/pull/215) - Stop using es6 syntax in the es6 file by [@​andrewbranch](https://togithub.com/andrewbranch) in [https://github.com/microsoft/tslib/pull/216](https://togithub.com/microsoft/tslib/pull/216) **Full Changelog**: https://github.com/microsoft/tslib/compare/2.6.0...v2.6.1

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