rabbit_db_vhost: Add no_return() to set_tags/2 spec

`set_tags/2` throws for database errors. This is benign since it's
caught by the CLI (the only caller) and turned into a Khepri-specific
error.

(cherry picked from commit 4fd77d5)

Author: the-mikedavis

deps/rabbit/src/rabbit_db_vhost.erl

@@ -190,7 +190,7 @@ merge_metadata_in_khepri(VHostName, Metadata) ->
 -spec set_tags(VHostName, Tags) -> VHost when
       VHostName :: vhost:name(),
       Tags :: [vhost:tag() | binary() | string()],
-      VHost :: vhost:vhost().
+      VHost :: vhost:vhost() | no_return().
 %% @doc Sets the tags of an existing virtual host record.
 %%
 %% @returns the updated virtual host record if the record existed and the