Revert "Update dependencies.py"

This reverts commit 846fc69.

Author: Killklli

src/ghastoolkit/supplychain/dependencies.py

@@ -51,7 +51,7 @@ def getPurl(self, version: bool = True) -> str:
         if self.manager:
             result += f"{self.manager.lower()}/"
         if self.namespace:
-            result += f"{self.namespace}/"
+            result += f"{self.namespace}:"
         result += f"{self.name}"
         if version and self.version:
             result += f"@{self.version}"