[skip ci] Add release notes for version 0.34.0

.chglog/0.34.0.md

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+## ⭐ Enhancements
+
+- Switzerland: Improve Switzerland [#655](https://github.com/focus-shift/jollyday/issues/655)
+
+## 🐞 Bugs
+
+- Naefels Trip date is on the second Thursday in April (but is on the first) [#635](https://github.com/focus-shift/jollyday/issues/635)
+
+## 🔨 Dependency upgrades
+
+- build(deps): bump ch.qos.logback:logback-classic from 1.5.11 to 1.5.12 [#651](https://github.com/focus-shift/jollyday/pull/651)
+- build(deps): bump com.fasterxml.jackson.dataformat:jackson-dataformat-xml from 2.18.0 to 2.18.1 [#653](https://github.com/focus-shift/jollyday/pull/653)
+- build(deps): bump org.apache.maven.plugins:maven-dependency-plugin from 3.8.0 to 3.8.1 [#652](https://github.com/focus-shift/jollyday/pull/652)
+
+## ❤️ Contributors
+
+We'd like to thank all the contributors who worked on this release!
+
+- [@derTobsch](https://github.com/derTobsch)