Set version to '2.2'

Lets consider moving the repo to the haifa3d github org a new feature, bumping the version number. This is mainly done to test that all the CI/CD automation is working from here too.

version.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
-  "version": "2.2-alpha",
+  "version": "2.2",
   "publicReleaseRefSpec": [
     "^refs/heads/release/v\\d+(?:\\.\\d+)?$"
   ],