chore(deps): update redis-py requirement to >=6.4.0

Update minimum redis-py version from 6.2.0 to 6.4.0 to enable
support for SVS-VAMANA vector indexing algorithm.

Author: Nitin Kanukolanu

pyproject.toml

@@ -24,7 +24,7 @@ classifiers = [
 dependencies = [
     "numpy>=1.26.0,<3",
     "pyyaml>=5.4,<7.0",
-    "redis>=5.0,<7.0",
+    "redis>=6.4.0,<7.0",
     "pydantic>=2,<3",
     "tenacity>=8.2.2",
     "ml-dtypes>=0.4.0,<1.0.0",