[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