Remove matrix in release workflow #44

Job	Run time
prepare	5s
build (v1.73.0, v1.73.0, macos-x86_64, macos-13, --config=macos, protoc-gen-grpc-python-macos-x86...	7m 33s
build (v1.73.0, v1.73.0, macos-arm64, macos-15, --config=macos, protoc-gen-grpc-python-macos-arm64)	3m 50s
build (v1.73.0, v1.73.0, linux-x86_64, ubuntu-24.04, --config=linux, protoc-gen-grpc-python-linux...	3m 1s
release	0s
	14m 29s

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