Updating pyarrow dependency for tfx libs to ">=6,<7".

PiperOrigin-RevId: 467044374

Author: tfx-copybara

RELEASE.md

@@ -6,6 +6,8 @@
 
 ## Bug Fixes and Other Changes
 
+*   Depends on `pyarrow>=6,<7`.
+
 ## Breaking Changes
 
 ## Deprecations

setup.py

@@ -80,7 +80,7 @@ def select_constraint(default, nightly=None, git_master=None):
             default='>=1.9.0,<1.10.0',
             nightly='>=1.10.0.dev',
             git_master='@git+https://github.com/tensorflow/metadata@master'),
-        'pyarrow>=1,<6',
+        'pyarrow>=6,<7',
     ],
     # Add in any packaged data.
     include_package_data=True,