fix black settings

ref:9042422
sync: https://proxy.sandbox.yandex-team.ru/2709204228

Author: gridnevvvit

tox.ini

@@ -38,13 +38,13 @@ commands =
 skip_install = true
 deps = black
 commands =
-    black ydb examples tests
+    black ydb examples tests --extend-exclude ydb/public/api
 
 [testenv:black]
 skip_install = true
 deps = black
 commands =
-    black --check ydb examples tests
+    black --check ydb examples tests --extend-exclude ydb/public/api
 
 [testenv:pylint]
 deps = pylint