Bump tslib from 2.7.0 to 2.8.0

[dependabot[bot]]

Bumps tslib from 2.7.0 to 2.8.0.

Release notes

Sourced from tslib's releases.

v2.8.0

What's Changed

• Validate export structure of every entrypoint by @​andrewbranch in microsoft/tslib#269
• Add rewriteRelativeImportExtension helper by @​andrewbranch in microsoft/tslib#270

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

Commits

• ca5f7fb 2.8.0
• 2334267 Merge pull request #270 from microsoft/rewriteRelativeImportExtension
• c4cde74 Missed update
• 27b2192 Little optimizations
• fece22a Add URL-ish test
• 9c731e9 Combine tsx case into regex
• 1c03288 Test and fix invalid declaration-looking extensions
• a55e9f7 Do more with a regex
• e828dac Shorten by one line
• e7b6aa0 Case insensitivity, remove lookbehind
• Additional commits viewable in compare view

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