Stop publishing redirect artifacts at `com.diffplug.gradle.spotless`

[liutikas]

https://plugins.gradle.org/plugin/com.diffplug.gradle.spotless

It has

Add this plugin to your build using the [plugins DSL](https://docs.gradle.org/current/userguide/plugins.html#sec:plugins_block):

plugins {
  id("com.diffplug.gradle.spotless") version "8.2.1"
}

if you do that you get:

Caused by: org.gradle.api.GradleException: We have moved from 'com.diffplug.gradle.spotless'
                to 'com.diffplug.spotless'
To migrate:
- Test your build with: id 'com.diffplug.gradle.spotless' version '4.5.1'
- Fix any deprecation warnings (shouldn't be many / any)
- Now you can use:      id 'com.diffplug.spotless' version '5.0.0'

[nedtwigg]

It's not possible for us to remove the old id from the portal, which is why we always publish to both points (and give a nice error message). But after all these years, it's probably okay for us to stop publishing to the old id.

I see that the deprecated artifact shows up first in the search. It's first alphabetically, but hopefully we stop publishing it will start to fall.