Bump typed-ast from 1.4.2 to 1.4.3

Bumps [typed-ast](https://github.com/python/typed_ast) from 1.4.2 to 1.4.3.
- [Release notes](https://github.com/python/typed_ast/releases)
- [Changelog](https://github.com/python/typed_ast/blob/master/release_process.md)
- [Commits](python/typed_ast@1.4.2...1.4.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

test-requirements.txt

@@ -123,7 +123,7 @@ traitlets==5.0.5
     # via ipython
 trustme==0.7.0
     # via -r test-requirements.in
-typed-ast==1.4.2 ; implementation_name == "cpython"
+typed-ast==1.4.3 ; implementation_name == "cpython"
     # via
     #   -r test-requirements.in
     #   black