unpin datafusion in pyproject

Change-Id: Iddf384fafe1a59157b780eea0ffa8e037599d372

Author: ddupg

python/pyproject.toml

@@ -61,8 +61,7 @@ tests = [
     # tensorflow is broken on 2.20.0 with macOS ARM.
     "tensorflow<=2.19.0",
     "tqdm",
-    # Need to align with the datafusion version we use at lance rust
-    "datafusion==50.0.0",
+    "datafusion>=48.0.0",
 ]
 dev = ["ruff==0.4.1", "pyright"]
 benchmarks = ["pytest-benchmark"]