Exclude Logback from minimization

This prevents the LogbackServiceProvider class from being deleted.

Signed-off-by: Graham <gpe@openrs2.org>

all/build.gradle.kts

@@ -30,6 +30,7 @@ tasks.shadowJar {
     archiveFileName.set("openrs2.jar")
 
     minimize {
+        exclude(dependency("ch.qos.logback:logback-classic"))
         exclude(dependency("com.github.jnr:jnr-ffi"))
         exclude(dependency("org.flywaydb:flyway-core"))
         exclude(dependency("org.jetbrains.kotlin:kotlin-reflect"))