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[bot] <[email protected]>

Author: dependabot[bot]

dev-requirements.txt

@@ -32,5 +32,5 @@ regex==2020.11.13
 snowballstemmer==2.1.0
 termcolor==1.1.0
 toml==0.10.2; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2'
-typed-ast==1.4.2
+typed-ast==1.4.3
 typing-extensions==3.10.0.0