MAINT: Make numpy.linalg.linalg private

Original NumPy Commit: 58999eafd76c0f7b2e1cd5d6f43c09ade3a1cd9a

Author: mtsokol

array_api_strict/linalg.py

@@ -297,9 +297,10 @@ def slogdet(x: Array, /) -> SlogdetResult:
 # To workaround this, the below is the code from np.linalg.solve except
 # only calling solve1 in the exactly 1D case.
 def _solve(a, b):
-    from numpy.linalg.linalg import (_makearray, _assert_stacked_2d,
-                                 _assert_stacked_square, _commonType,
-                                 isComplexType, _raise_linalgerror_singular)
+    from numpy.linalg._linalg import (
+        _makearray, _assert_stacked_2d, _assert_stacked_square,
+        _commonType, isComplexType, _raise_linalgerror_singular
+    )
     from numpy.linalg import _umath_linalg
 
     a, _ = _makearray(a)