Add changelog for 3.5.0-RC4

Author: WojciechMazur

changelogs/3.5.0-RC4.md

@@ -0,0 +1,19 @@
+# Backported fixes
+
+- Refine implicit priority change warnings [#21045](https://github.com/scala/scala3/pull/21045)
+- Use pathing jars in cli commands [#21121](https://github.com/scala/scala3/pull/21121)
+- expand classpath of pathing jars in scala_legacy command [#21160](https://github.com/scala/scala3/pull/21160)
+- Fix symbol reference retrivial of `scala.caps.Caps` [#20493](https://github.com/scala/scala3/pull/20493)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.5.0-RC3..3.5.0-RC4` these are:
+
+```
+     5  Martin Odersky
+     3  Wojciech Mazur
+     2  Hamza REMMAL
+     1  Jamie Thompson
+```