upgrade to Spring Boot 4.2.1

src/main/kotlin/de/hoennig/gittally/GitTallyApplication.kt

@@ -17,7 +17,8 @@ class GitTallyApplication
 class CliRunner(
     private val factory: IFactory,
     private val rootCommand: GitTallyCommand,
-) : CommandLineRunner, ExitCodeGenerator {
+) : CommandLineRunner,
+    ExitCodeGenerator {
     private var exitCode = 0
 
     override fun run(vararg args: String) {

src/main/kotlin/de/hoennig/gittally/GitTallyCommand.kt

@@ -15,7 +15,5 @@ import picocli.CommandLine.Command
     description = ["Lightweight, declarative CI/CD system"],
 )
 class GitTallyCommand : Runnable {
-    override fun run() {
-        throw CommandLine.ParameterException(CommandLine(this), "Specify a subcommand")
-    }
+    override fun run(): Unit = throw CommandLine.ParameterException(CommandLine(this), "Specify a subcommand")
 }