Update Paper API (#7245)

* Update Paper API

* test environments

---------

Co-authored-by: Moderocky <admin@moderocky.com>

build.gradle

@@ -30,7 +30,7 @@ dependencies {
 	shadow group: 'org.bstats', name: 'bstats-bukkit', version: '3.0.2'
 	shadow group: 'net.kyori', name: 'adventure-text-serializer-bungeecord', version: '4.3.2'
 
-	implementation group: 'io.papermc.paper', name: 'paper-api', version: '1.21.3-R0.1-SNAPSHOT'
+	implementation group: 'io.papermc.paper', name: 'paper-api', version: '1.21.4-R0.1-SNAPSHOT'
 	implementation group: 'com.google.code.findbugs', name: 'findbugs', version: '3.0.1'
 
 	// bundled with Minecraft 1.19.4+ for display entity transforms

src/test/skript/environments/java21/paper-1.21.4.json

@@ -0,0 +1,17 @@
+{
+	"name": "paper-1.21.4",
+	"resources": [
+		{"source": "server.properties.generic", "target": "server.properties"}
+	],
+	"paperDownloads": [
+		{
+			"version": "1.21.4",
+			"target": "paperclip.jar"
+		}
+	],
+	"skriptTarget": "plugins/Skript.jar",
+	"commandLine": [
+		"-Dcom.mojang.eula.agree=true",
+		"-jar", "paperclip.jar", "--nogui"
+	]
+}