Keeping versions in sync. with those in buildSrc/build.gradle.kts is prone to errors

[alexander-yevsyukov]

For some of the dependencies we have versions put into buildSrc/build.gradle.kts.

Even though there are comments saying about synching these versions with those declared in the dependency objects AND comments in the dependency objects saying that too, it's too easy to forget about this.

Even if you don't forget about it, it takes much time to find the dependency and put the same value.

We need to avoid this duplication or, at least, have an automated check that checks that the versions are in sync.