Relax protobuf upper bound to <6.0.0 for lqp compatibility (#158)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: gkastrinis

requirements.txt

@@ -1,6 +1,6 @@
 grpcio>=1.54.0,<=1.60.1
 grpcio-tools>=1.47.0,<=1.60.1
-protobuf>=3.20.3,<5.0.0
+protobuf>=3.20.3,<6.0.0
 pandas<3.0.0
 pyarrow>=10.0.0,<23.0.0
 requests-toolbelt==1.0.0

setup.py

@@ -40,7 +40,7 @@
         "pandas>=2.0.0,<3.0.0;python_version>'3.8'",
         "pyarrow>=10.0.0,<23.0.0",
         "requests-toolbelt==1.0.0",
-        "protobuf>=3.20.3,<5.0.0"],
+        "protobuf>=3.20.3,<6.0.0"],
     license="http://www.apache.org/licenses/LICENSE-2.0",
     long_description="Enables access to the RelationalAI REST APIs from Python",
     long_description_content_type="text/markdown",