Fix RUM version in updatecli script

Author: theletterf

updatecli/updatecli.d/versions.yml

@@ -287,7 +287,8 @@ sources:
       token: '{{ requiredEnv "GITHUB_TOKEN" }}'
       username: '{{ requiredEnv "GITHUB_ACTOR" }}'
       versionfilter:
-        kind: latest
+        kind: regex
+        pattern: "^v(\\d*).(\\d*).(\\d*)$"
 
 targets:
   update-docs-docset-stack: