revert back to 7.1.6

.yamato/environments.yml

 # sticking to 2019.4.6f1 for testing for now because Linux Editor fails to open PerceptionHDRP on 2019.4.8f1
 # see https://fogbugz.unity3d.com/default.asp?1273518_d68j5lb6eucglb84
 coverage_editors:
-  - version: 2020.1.15f1
+  - version: 2019.4.6f1
-per_commit_editors:  
+per_commit_editors:
+  - version: 2019.4.6f1
-  - version: 2020.2.0b1
+  - version: 2020.2.0b13
-  - version: 2020.2.0b11  
+  - version: 2020.2.0b13  
 
 publish_platforms:
   - name: win

com.unity.perception/package.json

 {
   "dependencies": {
     "com.unity.nuget.newtonsoft-json": "1.1.2",
-    "com.unity.render-pipelines.core": "8.2.0",
+    "com.unity.render-pipelines.core": "7.1.6",
     "com.unity.burst": "1.3.9",
     "com.unity.entities": "0.8.0-preview.8",
     "com.unity.simulation.client": "0.0.10-preview.9",