Increase memory used for forked compiler

When running the Gradle Daemon with a non-J21 JVM, it will fork the
Java compiler into a separate process rather than running it in-process
with the Daemon. However, that means the compiler process uses the
default amount of memory, which is not able to compile all of NeoForge &
Minecraft (as it fails with an OutOfMemoryError).

Setting the memory when the compiler is forked ensures that whether the
compiler runs in-process with the Daemon or as a forked process, it will
always have enough memory to compile all the sources properly.

projects/neoforge/build.gradle

@@ -222,6 +222,11 @@ generateAccessTransformers {
     )
 }
 
+tasks.withType(JavaCompile.class).configureEach {
+    // Increase memory used during compilation, to avoid OutOfMemoryErrors
+    options.forkOptions.memoryMaximumSize = '2g'
+}
+
 tasks.withType(Javadoc.class).configureEach {
     options.tags = [
             'apiNote:a:<em>API Note:</em>',