Add changelog for 3.2.0-RC3

Author: Kordyjan

changelogs/3.2.0-RC3.md

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+# Backported fixes
+
+- Refutable extractor may be an `Apply` tree [#15672](https://github.com/lampepfl/dotty/pull/15672)
+- Fix coverage instrumentation of Java-defined and parameterless methods [#15648](https://github.com/lampepfl/dotty/pull/15648)
+- Keep `fun` and `args` together when instrumenting `TypeApply` for coverage [#15739](https://github.com/lampepfl/dotty/pull/15739)
+- Fix two problems related to match types as array elements [#15625](https://github.com/lampepfl/dotty/pull/15625)
+- Survive TypeErrors in `isMatchedBy` [#15675](https://github.com/lampepfl/dotty/pull/15675)
+- deprecate `ToString` type which should be deprecated at 3.2.0 [#15645](https://github.com/lampepfl/dotty/pull/15645)
+- Fix constraining against `HKTypeLambda` arguments [#15688](https://github.com/lampepfl/dotty/pull/15688)
+- Fix computation of class nesting level in inliner [#15671](https://github.com/lampepfl/dotty/pull/15671)
+- Don't ignore expected types of `New` [#15679](https://github.com/lampepfl/dotty/pull/15679)
+- Better infos for dependent class parameter references [#15667](https://github.com/lampepfl/dotty/pull/15667)
+- Always expand inline accessor names [#15619](https://github.com/lampepfl/dotty/pull/15619)
+- Harden erasure of TermRefs [#15658](https://github.com/lampepfl/dotty/pull/15658)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges $3.2.0-RC2..3.2.0-RC3` these are:
+
+```
+    13  odersky
+     5  Guillaume Raffin
+     2  Paweł Marks
+     2  Tom Grigg
+     1  Dale Wijnand
+     1  rochala
+```