[common-utils]: Bug fix: Install zsh on an image previously built with "installZsh:false" (#649)

* [common-utils]: Bug fix: Installs zsh on an image built with installZsh:false

* version bump

* nit: fix merge conflicts

* Version bump

src/common-utils/devcontainer-feature.json

 {
     "id": "common-utils",
-    "version": "2.1.2",
+    "version": "2.1.3",
     "name": "Common Utilities",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/common-utils",
     "description": "Installs a set of common command line utilities, Oh My Zsh!, and sets up a non-root user.",