Mark Tensorflow Metadata compatible with Protobuf v30+.

PiperOrigin-RevId: 750637947

Author: tfx-copybara

RELEASE.md

@@ -6,6 +6,8 @@
 
 ## Bug Fixes and Other Changes
 
+*   Relax dependency on Protobuf to include version 6.x
+
 ## Breaking Changes
 
 ## Deprecations

setup.py

@@ -128,7 +128,7 @@ def run(self):
     install_requires=[
         'absl-py>=0.9,<3.0.0',
         'googleapis-common-protos>=1.56.4,<2;python_version>="3.11"',
-        'protobuf>=4.25.2,<6.0.0;python_version>="3.11"',
+        'protobuf>=4.25.2,<7.0.0;python_version>="3.11"',
         'protobuf>=4.21.6,<4.22;python_version<"3.11"',
     ],
     python_requires='>=3.9,<4',