build: unrestrict protobuf deps (canonical#421)

Since pycloudlib is consumed by various other projects and is often
not standalone, therefore, we should not unnecessarily restrict
dependencies. This dependency was added recently in PR canonical#409.

Author: a-dubs

VERSION

@@ -1 +1 @@
-1!10.0.0
+1!10.0.1

setup.cfg

@@ -31,15 +31,15 @@ install_requires =
     boto3 >= 1.14.20
     botocore >= 1.17.20
     google-cloud-compute
-    googleapis-common-protos == 1.63.1 # Fixes dependency issue with google-cloud-compute and the pinned version of protobuf
+    googleapis-common-protos >= 1.63.1
     ibm-cloud-sdk-core >= 3.14.0
     ibm-platform-services
     ibm-vpc >= 0.10
     knack >= 0.7.1
     oci >= 2.17.0
     openstacksdk >= 1.1.0, < 1.5.0
     paramiko >= 2.9.2
-    protobuf < 3.20.0
+    protobuf
     pyparsing >= 2, < 3.0.0
     python-openstackclient >= 5.2.1
     pyyaml >= 5.1