upgrade tensorflow-aarch64 version to v2.9.1

Author: tenzen-y

cmd/metricscollector/v1beta1/tfevent-metricscollector/requirements.txt

@@ -2,9 +2,5 @@ psutil==5.8.0
 rfc3339>=6.2
 grpcio==1.41.1
 googleapis-common-protos==1.6.0
-# TODO (tenzen-y): We need to delete the line to install protobuf after tensorflow-aarch64 v2.9.1, or higher has been released.
-# To avoid the `If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.` error,
-# we must restrict the protobuf version.
-protobuf >= 3.9.2, < 3.20; platform_machine=="aarch64"
 tensorflow==2.9.1; platform_machine=="x86_64"
-tensorflow-aarch64==2.9.0; platform_machine=="aarch64"
+tensorflow-aarch64==2.9.1; platform_machine=="aarch64"

cmd/suggestion/nas/enas/v1beta1/requirements.txt

@@ -1,9 +1,5 @@
 grpcio==1.41.1
 googleapis-common-protos==1.6.0
 cython>=0.29.24
-# TODO (tenzen-y): We need to delete the line to install protobuf after tensorflow-aarch64 v2.9.1, or higher has been released.
-# To avoid the `If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.` error,
-# we must restrict the protobuf version.
-protobuf >= 3.9.2, < 3.20; platform_machine=="aarch64"
 tensorflow==2.9.1; platform_machine=="x86_64"
-tensorflow-aarch64==2.9.0; platform_machine=="aarch64"
+tensorflow-aarch64==2.9.1; platform_machine=="aarch64"