chore(deps): update plugin com.diffplug.spotless to v6.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.diffplug.spotless	6.13.0 -> 6.15.0

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[szpak]

  - Incompatible because this component declares a component for use during compile-time, compatible with Java 11 and the consumer needed a component for use during runtime, compatible with Java 8

To be revised with #171 in place.

[renovate]

Renovate Ignore Notification

As this PR has been closed unmerged, Renovate will now ignore this update (6.15.0). You will still receive a PR once a newer version is released, so if you wish to permanently ignore this dependency, please add it to the ignoreDeps array of your renovate config.

If this PR was closed by mistake or you changed your mind, you can simply rename this PR and you will soon get a fresh replacement PR opened.