Improve comment, remove unecessary pins

recipe/meta.yaml

@@ -14,7 +14,7 @@ source:
     - patches/0004-Remove-all-dependencies-from-setup.py.patch
     # See https://github.com/conda-forge/ray-packages-feedstock/issues/136
     # Keep in sync with current or active migration of libgrpc to avoid
-    {% set grpcio_version = "1.59" %}
+    # ABI breakage
     - patches/0006-Vendor-grpc-1.59.3.patch
     # This patch applies grpc tag v1.59.3 changes from
     # https://github.com/grpc/grpc/blob/35df344f5e17a9cb290ebf0f5b0f03ddb1ff0a97/bazel/grpc_deps.bzl#L243
@@ -164,7 +164,7 @@ outputs:
         - async-timeout
         - colorful
         - gpustat >=1.0.0
-        - grpcio {{ grpcio_version }}
+        - grpcio
         - opencensus
         - prometheus_client >=0.7.1
         - py-spy >=0.2.0
@@ -188,7 +188,7 @@ outputs:
       run:
         - python
         - {{ pin_subpackage('ray-core', exact=True) }}
-        - grpcio {{ grpcio_version }}
+        - grpcio
     test:
       imports:
         - ray