chore(deps): update plugin idea-ext to v1.3

Author: renovate[bot]

gradle/libs.versions.toml

@@ -42,4 +42,4 @@ blossom = { id = "net.kyori.blossom", version.ref = "blossom" }
 shadow = { id = "com.gradleup.shadow", version.ref = "shadow" }
 runvelocity = { id = "xyz.jpenilla.run-velocity", version.ref = "runtask" }
 runpaper = { id = "xyz.jpenilla.run-velocity", version.ref = "runtask" }
-idea-ext = { id = "org.jetbrains.gradle.plugin.idea-ext", version = "1.2" }
+idea-ext = { id = "org.jetbrains.gradle.plugin.idea-ext", version = "1.3" }