Fix typing of credentials parameter of make_client in the Python SDK (#5609)

### Motivation and context
This is a very simple pull request. The type of the credentials
parameter of `make_client` is currently `Optional[Tuple[int, int]]`, but
it should be `Optional[Tuple[str, str]]` as used by `Client#login`. This
PR makes that change.

### How has this been tested?
The typing does not affect the functionality of the code (just the
warnings I get in an IDE).

CHANGELOG.md

@@ -48,6 +48,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed HRNet serverless function runtime error on images with alpha channel (<https://github.com/opencv/cvat/pull/5570>)
 - Preview & chunk cache settings are ignored (<https://github.com/opencv/cvat/pull/5569>)
 - Export annotations to Azure container (<https://github.com/opencv/cvat/pull/5596>)
+- Fix the type of the credentials parameter of make_client from the Python SDK
 
 ### Security
 - Fixed vulnerability with social authentication (<https://github.com/opencv/cvat/pull/5521>)

cvat-sdk/cvat_sdk/core/client.py

@@ -319,7 +319,7 @@ class CVAT_API_V2:
 
 
 def make_client(
-    host: str, *, port: Optional[int] = None, credentials: Optional[Tuple[int, int]] = None
+    host: str, *, port: Optional[int] = None, credentials: Optional[Tuple[str, str]] = None
 ) -> Client:
     url = host.rstrip("/")
     if port: