[Android] Set density only when non-null (microsoft#5047)

updating package versions in various package.json ahead of publish

Released uwp v2.3.0

Update custom props for 1.2 release (microsoft#4997)

Released dotnet v2.3.0

Release 20.09

Released uwp v2.2.0

Released dotnet v2.2.0

Fix pom generation for 20.08 (microsoft#4719)

* Fix pom generation (microsoft#4717)

* Add developers info (microsoft#4718)

Fix pom generation for 1.2 (microsoft#4720)

* Add developers info (microsoft#4718)

* Fix pom generation (microsoft#4717)