deps: update dependency typing-extensions to v4.3.0 (#814)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [typing-extensions](https://github.com/python/typing_extensions) ([changelog](https://github.com/python/typing_extensions/blob/main/CHANGELOG.md)) | `==4.1.1` -> `==4.3.0` | [![age](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/compatibility-slim/4.1.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/typing-extensions/4.3.0/confidence-slim/4.1.1)](https://docs.renovatebot.com/merge-confidence/) |

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