Temporarily point wp-config-transformer at dev-main for CI

wp-cli/wp-config-transformer#64 is merged but not yet released.
Using the VCS source + dev-main so CI can run against the fixed
code. Will revert to a version constraint once a release is cut.

Author: pwtyler

composer.json

@@ -16,9 +16,15 @@
             "homepage": "https://www.alainschlesser.com"
         }
     ],
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/wp-cli/wp-config-transformer"
+        }
+    ],
     "require": {
         "wp-cli/wp-cli": "^2.13",
-        "wp-cli/wp-config-transformer": "^1.4.0"
+        "wp-cli/wp-config-transformer": "dev-main"
     },
     "require-dev": {
         "wp-cli/db-command": "^1.3 || ^2",