build(deps): bump typed-ast from 1.4.1 to 1.4.3

Bumps [typed-ast](https://github.com/python/typed_ast) from 1.4.1 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@1.4.1...1.4.3)

---
updated-dependencies:
- dependency-name: typed-ast
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -140,7 +140,7 @@ travis==0.0.3
 
 twine==3.2.0
 
-typed-ast==1.4.1
+typed-ast==1.4.3
 
 typing-extensions==3.7.4.3
 

requirements-dev.txt

@@ -140,7 +140,7 @@ travis==0.0.3
 
 twine==3.2.0
 
-typed-ast==1.4.1
+typed-ast==1.4.3
 
 typing-extensions==3.7.4.3