Bump helm-rb to address security vuln in Helm (#3178)

Author: camertron

demo/gemfiles/kuby.gemfile.lock

@@ -75,9 +75,9 @@ GEM
       signet (>= 0.16, < 2.a)
     helm-cli (0.3.0)
       helm-rb (~> 0.1)
-    helm-rb (0.2.1-arm64-darwin)
-    helm-rb (0.2.1-x86_64-darwin)
-    helm-rb (0.2.1-x86_64-linux)
+    helm-rb (0.3.0-arm64-darwin)
+    helm-rb (0.3.0-x86_64-darwin)
+    helm-rb (0.3.0-x86_64-linux)
     http (5.1.1)
       addressable (~> 2.8)
       http-cookie (~> 1.0)