deps: bump org.bstats:bstats-bukkit from 3.1.0 to 3.2.1 (#959)

Bumps org.bstats:bstats-bukkit from 3.1.0 to 3.2.1.

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updated-dependencies:

• dependency-name: org.bstats:bstats-bukkit dependency-version: 3.2.1 dependency-type: direct:production update-type: version-update:semver-minor ...

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