build: migrate minestom:app to Blossom 2.x DSL

The upstream merge brought net.kyori.blossom 2.2.0, whose DSL replaced
the top-level blossom { replaceTokenIn / replaceToken } block. Use the
sourceSets.main.blossom.javaSources.property form (matching upstream
common/build.gradle) and the {{ version }} placeholder in
LuckPermsApplication.

https://claude.ai/code/session_01S76fk9ma5Szkf9r1W44RVP

Author: claude

minestom/app/build.gradle

@@ -45,9 +45,14 @@ dependencies {
     }
 }
 
-blossom {
-    replaceTokenIn('src/main/java/me/lucko/luckperms/minestom/app/LuckPermsApplication.java')
-    replaceToken '@version@', project.ext.fullVersion
+sourceSets {
+    main {
+        blossom {
+            javaSources {
+                property 'version', project.ext.fullVersion
+            }
+        }
+    }
 }
 
 // Only used occasionally for deployment - not needed for normal builds.

minestom/app/src/main/java/me/lucko/luckperms/minestom/app/LuckPermsApplication.java

@@ -28,6 +28,6 @@
 public final class LuckPermsApplication {
 
     public String getVersion() {
-        return "@version@";
+        return "{{ version }}";
     }
 }