Update versions.hcl in prep for 1.17 release (#27381)

- With the upcoming 1.17 release, mark previous CE branches
   as no longer active, and drop the 1.14 branch from the list
   of active branches

.release/versions.hcl

@@ -9,14 +9,10 @@ active_versions {
     ce_active = true
   }
   version "1.16.x" {
-    ce_active = true
+    ce_active = false
     lts       = true
   }
   version "1.15.x" {
-    ce_active = true
+    ce_active = false
   }
-  version "1.14.x" {
-    ce_active = true
-  }
-
 }