[skip ci] Add release notes for version 0.12.0

.chglog/0.12.0.md

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+## 🐞 Bugs
+
+- com.sun.xml.bind dependency clashes with Spring Boot 3.0.1's org.glassfish.jaxb:jaxb-runtime:4.0.1 [#173](https://github.com/focus-shift/jollyday/issues/173)
+- Remove easter from Malta public holidays [#162](https://github.com/focus-shift/jollyday/issues/162)
+
+## 🔨 Dependency upgrades
+
+- Bump assertj-core from 3.23.1 to 3.24.1 [#165](https://github.com/focus-shift/jollyday/pull/165)
+- Bump assertj-core from 3.24.1 to 3.24.2 [#168](https://github.com/focus-shift/jollyday/pull/168)
+- Bump junit-jupiter from 5.9.1 to 5.9.2 [#171](https://github.com/focus-shift/jollyday/pull/171)
+- Bump maven-dependency-plugin from 3.4.0 to 3.5.0 [#172](https://github.com/focus-shift/jollyday/pull/172)
+- Bump maven-enforcer-plugin from 3.1.0 to 3.2.1 [#177](https://github.com/focus-shift/jollyday/pull/177)
+- Bump mockito.version from 4.11.0 to 5.0.0 [#170](https://github.com/focus-shift/jollyday/pull/170)
+- Bump mockito.version from 5.0.0 to 5.1.1 [#175](https://github.com/focus-shift/jollyday/pull/175)
+- Bump restrict-imports-enforcer-rule from 2.0.0 to 2.1.0 [#166](https://github.com/focus-shift/jollyday/pull/166)
+- Bump slf4j-api from 1.7.36 to 2.0.6 [#155](https://github.com/focus-shift/jollyday/pull/155)
+- Bump xmlunit-core from 2.9.0 to 2.9.1 [#169](https://github.com/focus-shift/jollyday/pull/169)
+
+## ❤️ Contributors
+
+We'd like to thank all the contributors who worked on this release!
+
+- [@derTobsch](https://github.com/derTobsch)
+- [@gotfrydoh](https://github.com/gotfrydoh)