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"gradle build script" is a convention plugin within `buildSrc` I guess?

Then yeah, you cannot use type-safe version catalog accessors in those, except with my hack-around from the according GitHub issue.
So without my hack-around you need to use the string-y API like you showed, yes. Or you generate something at `buildSrc` build time from the version catalog that you then can use in the convention plugin code.

Fwiw, I'd rather use `requiredVersion` than `toString()`.
Also, in case you're OK with requiring JDK 9+ to run Gradle, use `orElseThrow()` rather than `get()`.

also you can use the android settings plugin to centralize compileSdk instead of applying configuration to every project