Disambiguate mordant.pro

[TWiStErRob]

This change enables use of duplicatesStrategy = DuplicatesStrategy.FAIL, which currently fails due to:

What went wrong:
> Execution failed for task ':ghlint-cli:fatJar'.
Cannot copy zip entry 'Z:\caches\gradle\caches\modules-2\files-2.1\com.github.ajalt.mordant\mordant-jvm-graal-ffi-jvm\3.0.0\e5c456bbad024da819bffde07a223ae6cb9582a3\mordant-jvm-graal-ffi-jvm.jar!META-INF/proguard/mordant.pro' to 'META-INF/proguard/mordant.pro' because zip entry 'Z:\caches\gradle\caches\modules-2\files-2.1\com.github.ajalt.mordant\mordant-jvm-jna-jvm\3.0.0\bde15ea7842e9b77dec187390cde07bf6c15b14d\mordant-jvm-jna-jvm.jar!META-INF/proguard/mordant.pro' has already been copied there.

Note: even though DuplicateStrategy.INCLUDE works around this problem, R8 does not support it:

> Task :ghlint-cli:r8Jar
Warning: Resource 'META-INF/proguard/mordant.pro' already exists.