community[patch], mongodb[patch]: Stop spamming SIMD import warnings (#19531)

If you use an embedding dist function in an eval loop, you get warned
every time. Would prefer to just check once and forget about it.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/community/langchain_community/utils/math.py

@@ -31,7 +31,7 @@ def cosine_similarity(X: Matrix, Y: Matrix) -> np.ndarray:
             return np.array([Z])
         return np.array(Z)
     except ImportError:
-        logger.info(
+        logger.debug(
             "Unable to import simsimd, defaulting to NumPy implementation. If you want "
             "to use simsimd please install with `pip install simsimd`."
         )