Remove ref and sha from semgrep plugin source

.claude-plugin/marketplace.json

@@ -667,9 +667,7 @@
       "category": "security",
       "source": {
         "source": "url",
-        "url": "https://github.com/semgrep/mcp-marketplace.git",
-        "ref": "main",
-        "sha": "9fa3dd7166a15a4fa04aea00116176a03867328d"
+        "url": "https://github.com/semgrep/mcp-marketplace.git"
       },
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
     }