Adapt tests to testthat v3.3.0#554

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fweber144 merged 2 commits intostan-dev:masterfrom

fweber144:testthat_v3.3.0

Jan 9, 2026

Commits on Jan 6, 2026

adapt snapshot file names to a change in testthat v3.3.0
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use `expect_doppelganger_cust()` instead of `vdiffr::expect_doppelganger()` whenever
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