APPS: Set CNBBuilderImage_Heroku22 to v0.96.0 (#1887)

Align local doctl apps dev builds with apps-images stable v0.96.0
(Node.js buildpack 342 / Node 24.15.0).

Author: rdhimando123

internal/apps/builder/cnb.go

@@ -26,7 +26,7 @@ import (
 const (
 	// CNBBuilderImage represents the local cnb builder.
 	CNBBuilderImage_Heroku18 = "digitaloceanapps/cnb-local-builder:heroku-18_v0.73.1"
-	CNBBuilderImage_Heroku22 = "digitaloceanapps/cnb-local-builder:heroku-22_v0.87.0"
+	CNBBuilderImage_Heroku22 = "digitaloceanapps/cnb-local-builder:heroku-22_v0.96.0"
 
 	CNBAppsRunImage_Heroku18 = "digitaloceanapps/apps-run:heroku-18_c047ec7"