Update dependency com.diffplug.gradle.spotless:com.diffplug.gradle.spotless.gradle.plugin to v3.26.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
com.diffplug.gradle.spotless:com.diffplug.gradle.spotless.gradle.plugin	patch	3.26.0 -> 3.26.1

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