Add changelog for 3.5.0-RC3

changelogs/3.5.0-RC3.md

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+# Backported fixes
+
+- Release .zip instead of .tar.gz for windows in sdkman [#20630](https://github.com/scala/scala3/pull/20630)
+- SIP 46 - read classpath from file, remove lib directory in distribution [#20631](https://github.com/scala/scala3/pull/20631)
+- Bump scala-cli to 1.4.0 [#20859](https://github.com/scala/scala3/pull/20859)
+- Priority warning fix alternative [#20487](https://github.com/scala/scala3/pull/20487)
+- Add --skip-cli-updates by default to the scala command [#20900](https://github.com/scala/scala3/pull/20900)
+- Upgrade Scala 2 to 2.13.14 (was 2.13.12) [#20902](https://github.com/scala/scala3/pull/20902)
+- fix issue 20901: etaCollapse context bound type [#20910](https://github.com/scala/scala3/pull/20910)
+- Use final result type to check selector bound [#20989](https://github.com/scala/scala3/pull/20989)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.5.0-RC2..3.5.0-RC3` these are:
+
+```
+     6  Wojciech Mazur
+     5  Jamie Thompson
+     5  Martin Odersky
+     4  Hamza Remmal
+     1  Hamza REMMAL
+     1  Seth Tisue
+     1  Som Snytt
+```