fix(sumup): re-path to repo root — upstream moved plugin out of providers/claude/plugin

.claude-plugin/marketplace.json

@@ -3407,8 +3407,7 @@
       "source": {
         "source": "url",
         "url": "https://github.com/sumup/sumup-skills.git",
-        "path": "providers/claude/plugin",
-        "sha": "700da2e866a71c7acbfcb0f2940ad7fa19955ae4"
+        "sha": "937ad2118bf928087706431ee60cedf8a8a44d3c"
       },
       "homepage": "https://www.sumup.com/"
     },