Bump spotless-maven-plugin from 2.21.0 to 2.28.0#100

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dependabot/maven/com.diffplug.spotless-spotless-maven-plugin-2.28.0jimklimov/github-branch-source-plugin:dependabot/maven/com.diffplug.spotless-spotless-maven-plugin-2.28.0Copy head branch name to clipboard