Bump tslib from 1.11.2 to 1.12.0 (#8296)
Bumps [tslib](https://github.com/Microsoft/tslib) from 1.11.2 to 1.12.0.
- [Release notes](https://github.com/Microsoft/tslib/releases)
- [Commits](https://github.com/Microsoft/tslib/compare/1.11.2...1.12.0)
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