Revert "External Version bump for alpinelinux new version string "3.15""

This reverts commit 22225d9996e075fce4ac969fec0d791255377280.

3.15 not released yet, reverting to 3.14

roles/netbootxyz/defaults/main.yml

@@ -129,8 +129,8 @@ releases:
     mirror: http://dl-cdn.alpinelinux.org
     name: Alpine Linux
     versions:
-    - code_name: v3.15
-      name: '3.15'
+    - code_name: v3.14
+      name: '3.14'
     - code_name: edge
       name: Edge (development)
   anarchy: