chore: bump openclaw plugin version to 0.7.3 in registry

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: wey-gu

integrations.json

@@ -182,7 +182,7 @@
       "name": "OpenClaw",
       "category": "coding",
       "type": "plugin",
-      "version": "0.7.1",
+      "version": "0.7.3",
       "directory": "nowledge-mem-openclaw-plugin",
       "transport": "cli",
       "capabilities": {