fixed syntax errrors in constants.pyi

src/scientific_plots/__init__.py

@@ -5,4 +5,4 @@ useful across several different projects and repositories. It also contains
 stub-files with several data-type annotations for scipy and matplot-lib
 functions."""
 
-__version__ = "1.8.0"
+__version__ = "1.8.1"

src/scipy-stubs/constants.pyi

@@ -2,6 +2,8 @@
 """
 Stub file for sciypy-constants.
 """
+from typing import Dict, Tuple
+
 pi: float
 golden: float
 golden_ratio: float
@@ -11,13 +13,13 @@ Boltzmann: float
 gas_constant: float
 
 
-value(key: str) -> float: ...
+def value(key: str) -> float: ...
 
 
-unit(key: str) -> str: ...
+def unit(key: str) -> str: ...
 
 
-precision(key: str) -> float: ...
+def precision(key: str) -> float: ...
 
 
-physical_constants: dict[str, tuple[float, str, float]]
+physical_constants: Dict[str, Tuple[float, str, float]]