Add helm-registry in docs page for private registries (#56682)

Co-authored-by: mchammer01 <[email protected]>

Author: rickreyhsig

content/code-security/dependabot/working-with-dependabot/configuring-access-to-private-registries-for-dependabot.md

@@ -160,7 +160,8 @@ Examples of how to configure access to the private registries supported by {% da
 * [`cargo-registry`](#cargo-registry)
 * [`composer-repository`](#composer-repository)
 * [`docker-registry`](#docker-registry)
-* [`git`](#git)
+* [`git`](#git){% ifversion dependabot-helm-support %}
+* [`helm-registry`](#helm-registry){% endif %}
 * [`hex-organization`](#hex-organization)
 * [`hex-repository`](#hex-repository)
 * [`maven-repository`](#maven-repository)