Update plugin com.diffplug.eclipse.apt to v3.33.1

Author: renovate-bot

build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
     base
-    id("com.diffplug.eclipse.apt") version "3.33.0" apply false
+    id("com.diffplug.eclipse.apt") version "3.33.1" apply false
     id("com.diffplug.spotless") version "5.15.2" apply false
     id("org.seasar.doma.compile") version "1.1.0" apply false
     kotlin("jvm") version "1.5.31" apply false