Add changelog for 3.3.1-RC2

[Cherry-picked 1451dc5]

Author: Kordyjan

changelogs/3.3.1-RC2.md

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+# Backported fixes
+
+- Dealias types in `New`` before matching quotes [#17615](https://github.com/lampepfl/dotty/pull/17615)
+- Fix `accessibleType` for package object prefixes [#18057](https://github.com/lampepfl/dotty/pull/18057)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.3.1-RC1..3.3.1-RC2` these are:
+
+```
+     2 Martin Odersky
+     2 Paweł Marks
+     1 Nicolas Stucki
+```