[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

pre_commit_hooks/check_executables_have_shebangs.py

diff --git a/pre_commit_hooks/check_executables_have_shebangs.py b/pre_commit_hooks/check_executables_have_shebangs.py
index d8e4f49..7c984d3 100644
--- a/pre_commit_hooks/check_executables_have_shebangs.py
+++ b/pre_commit_hooks/check_executables_have_shebangs.py
@@ -35,7 +35,7 @@
     filename: str
 
 
-def git_ls_files(paths: Sequence[str]) -> Generator[GitLsFile, None, None]:
+def git_ls_files(paths: Sequence[str]) -> Generator[GitLsFile]:
     outs = cmd_output('git', 'ls-files', '-z', '--stage', '--', *paths)
     for out in zsplit(outs):
         metadata, filename = out.split('\t')

pre_commit_hooks/check_yaml.py

diff --git a/pre_commit_hooks/check_yaml.py b/pre_commit_hooks/check_yaml.py
index 9563347..0187392 100644
--- a/pre_commit_hooks/check_yaml.py
+++ b/pre_commit_hooks/check_yaml.py
@@ -11,7 +11,7 @@
 yaml = ruamel.yaml.YAML(typ='safe')
 
 
-def _exhaust(gen: Generator[str, None, None]) -> None:
+def _exhaust(gen: Generator[str]) -> None:
     for _ in gen:
         pass