Add changelog for 3.4.1-RC2

changelogs/3.4.1-RC2.md

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+# Backported fixes
+
+- Adjust owner in Interactive.contextOfPath causing crash in ImplicitSearch [#19875](https://github.com/lampepfl/dotty/pull/19875)
+- Add GADT symbols when typing typing-ahead lambda bodies[#19644](https://github.com/lampepfl/dotty/pull/19644)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.4.1-RC1..3.4.1-RC2` these are:
+
+```
+     4	Hamza REMMAL
+     2	Dale Wijnand
+     2	Paweł Marks
+     1	Jędrzej Rochala
+
+```