chore(deps): update plugin shadow to v8.3.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.gradleup.shadow	8.3.8 -> 8.3.9

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Release Notes

GradleUp/shadow (com.gradleup.shadow)

v8.3.9

Compare Source

[!WARNING]
Only Gradle 9 support is being backported to this version. No additional features or crucial bug fixes will be included in the 8.x line. Please migrate to Shadow 9 as soon as possible.

Changed

• Use BufferedOutputStream when writing the Zip file to improve performance. (#​1579)

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