Update release procedure - new entries on scala-lang website

[bishabosha]

On each stable release, update https://github.com/scala/scala-lang/blob/main/_data/scala-releases.yml with the current scala 3 release

e.g.

 - category: current_version
+  title: Current 3.2.x release
-  title: Current 3.1.x release
+  version: 3.2.0
-  version: 3.1.2
+  release_date: June 7, 2022
-  release_date: March 12, 2022
 - category: current_version
   title: Current 2.13.x release
   version: 2.13.8
   release_date: January 12, 2022
 - category: maintenance_version
   title: Latest 2.12.x maintenance release
   version: 2.12.15

[bishabosha]

Also, update docs.scala-lang/api/all, following scala/docs.scala-lang#2344

Additionally, the _downloads/*-3.x.x.md metadata should add an api_docs field, following scala/scala-lang#1352