[VOL-5545] Update protobuf dependency to support protobuf 4.x

Remove protobuf<4.0.0dev upper bound and update googleapis-common-protos
to allow installation alongside voltha-protos 5.7+ which requires
protobuf>=4.25.0. Bump version to 1.18.2.

Signed-off-by: Serkant Uluderya <serkant.uluderya@netsia.com>
Change-Id: I88c779822c588c940ad4319346ba6418b1a1f8d7
diff --git a/VERSION b/VERSION
index ec6d649..b57fc72 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.18.1
+1.18.2
diff --git a/setup.py b/setup.py
index a62a99e..3917687 100644
--- a/setup.py
+++ b/setup.py
@@ -38,8 +38,8 @@
     packages = find_packages(where="python"),
     package_dir = {"": "python"},
     install_requires = [
-        "protobuf >=3.6.0, <4.0.0dev",
-        "googleapis-common-protos==1.52.0"
+        "protobuf>=3.12.0",
+        "googleapis-common-protos>=1.52.0"
     ],
     include_package_data=True,
 )