replaced absoute package path with relative one

TestProjects/PerceptionHDRP_2020.1/Packages/manifest.json

     "com.unity.ide.rider": "1.2.1",
     "com.unity.ide.visualstudio": "2.0.2",
     "com.unity.ide.vscode": "1.2.2",
-    "com.unity.perception": "file:C:/repos/com.unity.perception/com.unity.perception",
+    "com.unity.perception": "file:../../../com.unity.perception",
     "com.unity.render-pipelines.high-definition": "8.2.0",
     "com.unity.test-framework": "1.1.16",
     "com.unity.textmeshpro": "3.0.1",

TestProjects/PerceptionHDRP_2020.1/Packages/packages-lock.json

       "url": "https://packages.unity.com"
     },
     "com.unity.perception": {
-      "version": "file:C:/repos/com.unity.perception/com.unity.perception",
+      "version": "file:../../../com.unity.perception",
       "depth": 0,
       "source": "local",
       "dependencies": {

TestProjects/PerceptionURP_2020.1/Packages/manifest.json

     "com.unity.ide.rider": "1.2.1",
     "com.unity.ide.visualstudio": "2.0.2",
     "com.unity.ide.vscode": "1.2.2",
-    "com.unity.perception": "file:C:/repos/com.unity.perception/com.unity.perception",
+    "com.unity.perception": "file:../../../com.unity.perception",
     "com.unity.render-pipelines.universal": "8.2.0",
     "com.unity.test-framework": "1.1.16",
     "com.unity.textmeshpro": "3.0.1",

TestProjects/PerceptionURP_2020.1/Packages/packages-lock.json

       "url": "https://packages.unity.com"
     },
     "com.unity.perception": {
-      "version": "file:C:/repos/com.unity.perception/com.unity.perception",
+      "version": "file:../../../com.unity.perception",
       "depth": 0,
       "source": "local",
       "dependencies": {