test: remove pyarrow prerelease pin (#327)

The referred upstream issue has been fixed. See: https://togithub.com/apache/arrow/issues/45380

fixes #321

Author: Linchin

db_dtypes/json.py

@@ -257,8 +257,10 @@ def __array__(self, dtype=None, copy: bool | None = None) -> np.ndarray:
 
 
 class JSONArrowScalar(pa.ExtensionScalar):
-    def as_py(self):
-        return JSONArray._deserialize_json(self.value.as_py() if self.value else None)
+    def as_py(self, **kwargs):
+        return JSONArray._deserialize_json(
+            self.value.as_py(**kwargs) if self.value else None
+        )
 
 
 class JSONArrowType(pa.ExtensionType):

noxfile.py

@@ -199,10 +199,7 @@ def prerelease(session, tests_path):
         "--prefer-binary",
         "--pre",
         "--upgrade",
-        # Limit pyarrow to versions prior to 20.0.0.dev19 to prevent a RuntimeWarning
-        # during import.  This workaround can be removed once the underlying issue
-        # in pyarrow is resolved (see: https://github.com/apache/arrow/issues/45380).
-        "pyarrow<=20.0.0.dev18",
+        "pyarrow",
     )
     # Avoid pandas==2.2.0rc0 as this version causes PyArrow to fail. Once newer
     # prerelease comes out, this constraint can be removed. See