change(version): Update version to 6.0.0

Author: AdityaHPatwardhan

.gitlab/ci/common.yml

@@ -35,7 +35,7 @@ variables:
   # --prune --prune-tags: in case remote branch or tag is force pushed
   GIT_FETCH_EXTRA_FLAGS: "--no-recurse-submodules --prune --prune-tags"
 
-  LATEST_GIT_TAG: v6.0-rc1
+  LATEST_GIT_TAG: v6.0
 
   SUBMODULE_FETCH_TOOL: "tools/ci/ci_fetch_submodule.py"
   # by default we will fetch all submodules