Update plugin com.gradleup.shadow to v9.0.0-beta4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.gradleup.shadow	9.0.0-beta2 -> 9.0.0-beta4

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Release Notes

GradleUp/shadow (com.gradleup.shadow)

v9.0.0-beta4

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Changed

• BREAKING CHANGE: Some public getters are removed from SimpleRelocator, includes and excludes are exposed as SetPropertys. (#​1079)

Fixed

• Adjust property initializations and modifiers in ShadowJar. (#​1090)
  This fixes the regression for registering custom ShadowJar tasks.

v9.0.0-beta3

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