fix(deps): update dependency it.unimi.dsi:fastutil-core to v8.5.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
it.unimi.dsi:fastutil-core (source)	8.5.13 -> 8.5.15

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Release Notes

vigna/fastutil (it.unimi.dsi:fastutil-core)

v8.5.15

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