style: add type annotations to unpacked tuple variables

Added explicit type annotations for err and tb variables when
unpacking error_info tuples in _acquire() and _release() methods.

Author: vlad-scherbich

ddtrace/profiling/collector/_lock.py

@@ -187,6 +187,8 @@ def _acquire(self, inner_func: Callable[..., Any], *args: Any, **kwargs: Any) ->
                 # Instrumentation must never crash user code
                 pass  # nosec
         if error_info is not None:
+            err: BaseException
+            tb: Optional[TracebackType]
             err, tb = error_info
             raise err.with_traceback(tb)
 
@@ -222,6 +224,8 @@ def _release(self, inner_func: Callable[..., Any], *args: Any, **kwargs: Any) ->
                 # Instrumentation must never crash user code
                 pass  # nosec
         if error_info is not None:
+            err: BaseException
+            tb: Optional[TracebackType]
             err, tb = error_info
             raise err.with_traceback(tb)