Use `gradle-buildconfig-plugin` to generate dependency versions

[Goooler]

Generate build config for the versions like

https://github.com/diffplug/spotless/blame/a0ac60042bb4470f9dd7992e11541ca37d025f75/lib/build.gradle#L99

And refer to the generated config for

spotless/lib/src/main/java/com/diffplug/spotless/java/GoogleJavaFormatStep.java

Line 124 in 8d4cd28

.add(17, "1.28.0"); // default version

There is an example like https://github.com/vanniktech/gradle-maven-publish-plugin/blob/d0e50fec7a07ef91fde62ae5cb0e4b4b4769d797/plugin/build.gradle.kts#L35-L110

This should be stacked on #2704.