Fixed tests [skip ci]

Author: ankane

pgvector/bit.py

@@ -9,11 +9,11 @@ def __init__(self, value: bytes | str | list[bool] | np.ndarray[tuple[int], np.d
             length = 8 * len(value)
             data = value
         else:
+            import numpy as np
+
             if isinstance(value, str):
                 value = [v != '0' for v in value]
             else:
-                import numpy as np
-
                 value = np.asarray(value)
 
                 # for mypy
@@ -52,6 +52,7 @@ def to_list(self) -> list[bool]:
         return self.to_numpy().tolist()
 
     def to_numpy(self) -> np.ndarray[tuple[int], np.dtype[np.bool]]:
+        import numpy as np
         return np.unpackbits(np.frombuffer(self._value[4:], dtype=np.uint8), count=self._length()).astype(bool)
 
     def to_text(self) -> str: