Add changelog for 3.5.1-RC2

changelogs/3.5.1-RC2.md

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+# Backported fixes
+
+- Update MiMa and Reference Version to 3.5.0 [#21374](https://github.com/scala/scala3/pull/21374)
+- Fix healAmbiguous to compareAlternatives with disambiguate = true [#21372](https://github.com/scala/scala3/pull/21372)
+- Bump scala-cli to 1.4.1 + drop old cli management [#21234](https://github.com/scala/scala3/pull/21234)
+- Bump scala-cli to 1.4.3 [#21338](https://github.com/scala/scala3/pull/21338)
+- Emit generatedNonLocalClass in backend when callback is not enabled [#21186](https://github.com/scala/scala3/pull/21186)
+
+# Reverted changes
+
+- Heal member-select on opaque reference [#21340](https://github.com/scala/scala3/pull/21340)
+- Approximate MatchTypes with lub of case bodies, if non-recursive [#21267](https://github.com/scala/scala3/pull/21267)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.5.1-RC1..3.5.1-RC2` these are:
+
+```
+    8  Wojciech Mazur
+    5  Hamza REMMAL
+    5  Martin Odersky
+    2  Eugene Flesselle
+    2  Jamie Thompson
+    1  Dale Wijnand
+```