Bump mapstructVersion from 1.5.5.Final to 1.6.0 (#3232)

Bumps `mapstructVersion` from 1.5.5.Final to 1.6.0.

Updates `org.mapstruct:mapstruct` from 1.5.5.Final to 1.6.0
- [Release notes](https://github.com/mapstruct/mapstruct/releases)
- [Commits](mapstruct/mapstruct@1.5.5.Final...1.6.0)

Updates `org.mapstruct:mapstruct-processor` from 1.5.5.Final to 1.6.0
- [Release notes](https://github.com/mapstruct/mapstruct/releases)
- [Commits](mapstruct/mapstruct@1.5.5.Final...1.6.0)

---
updated-dependencies:
- dependency-name: org.mapstruct:mapstruct
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.mapstruct:mapstruct-processor
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -259,7 +259,7 @@ dependencies {
   implementation("io.github.micheljung:fxstage:0.8.3")
   implementation("io.github.micheljung:jfx-waitomo-theme:0.3.0")
   implementation("org.kitteh.irc:client-lib:9.0.0")
-  def mapstructVersion = "1.5.5.Final"
+  def mapstructVersion = "1.6.0"
   implementation("org.mapstruct:mapstruct:${mapstructVersion}")
   implementation("com.code-disaster.steamworks4j:steamworks4j:1.9.0")
 
@@ -299,7 +299,7 @@ dependencies {
   annotationProcessor("org.projectlombok:lombok")
   annotationProcessor("org.mapstruct:mapstruct-processor:${mapstructVersion}")
   testAnnotationProcessor("org.projectlombok:lombok")
-  testAnnotationProcessor("org.mapstruct:mapstruct-processor:1.5.5.Final")
+  testAnnotationProcessor("org.mapstruct:mapstruct-processor:1.6.0")
   compileOnly("org.projectlombok:lombok")
   testCompileOnly("org.projectlombok:lombok")