[skip ci] Add release notes for version 0.27.0

.chglog/0.27.0.md

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+## ⭐ Enhancements
+
+- Caching "getHolidays" [#460](https://github.com/focus-shift/jollyday/issues/460)
+
+## 🐞 Bugs
+
+- Whit Sunday missing in Liechtenstein [#478](https://github.com/focus-shift/jollyday/issues/478)
+- Åland Islands Whit Sunday is missing [#477](https://github.com/focus-shift/jollyday/issues/477)
+
+## 🔨 Dependency upgrades
+
+- Bump ch.qos.logback:logback-classic from 1.5.0 to 1.5.1 [#476](https://github.com/focus-shift/jollyday/pull/476)
+- Bump ch.qos.logback:logback-classic from 1.5.1 to 1.5.3 [#481](https://github.com/focus-shift/jollyday/pull/481)
+- Bump mockito.version from 5.10.0 to 5.11.0 [#475](https://github.com/focus-shift/jollyday/pull/475)
+
+## ❤️ Contributors
+
+We'd like to thank all the contributors who worked on this release!
+
+- [@derTobsch](https://github.com/derTobsch)