Removed .19f1 requirement from PPV2 package. Any Unity 2020.1 and up should be supported.

Packages/com.unity.postprocessing@3.2.2/package.json

@@ -3,7 +3,6 @@
   "version": "3.4.0",
   "displayName": "Post Processing",
   "unity": "2020.1",
-  "unityRelease": "19f1",
   "description": "The post-processing stack (v2) comes with a collection of effects and image filters you can apply to your cameras to improve the visuals of your games.",
   "dependencies": {
     "com.unity.modules.physics": "1.0.0",