fixed manifest.json bug

Author: karasusan

Packages/manifest.json

@@ -7,6 +7,7 @@
     "com.unity.package-manager-doctools": "1.1.0-preview.1",
     "com.unity.package-manager-ui": "2.1.2",
     "com.unity.purchasing": "2.0.1",
+    "com.unity.render-pipelines.high-definition": "5.7.2-preview",
     "com.unity.textmeshpro": "1.3.0",
     "com.unity.webrtc": "0.1.0-preview",
     "com.unity.xr.legacyinputhelpers": "1.0.0",