Update plugin shadow to v8.3.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.gradleup.shadow	8.3.0 -> 8.3.1

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Release Notes

GradleUp/shadow (com.gradleup.shadow)

v8.3.1

Compare Source

Added

• Apply an empty plugin that has the legacy com.github.johnrengelman.shadow plugin ID.
  This allows existing build logic to keep on reacting to the legacy plugin as the replacement is drop-in currently.

Fixed

• Explicitly add classifier to maven publication. (#​904)
• Refix excluding Gradle APIs for java-gradle-plugin. (#​948)

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[marcphilipp]

I reported GradleUp/shadow#965 to fix the root cause.

[renovate]

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