⬆️ Update `terser` to v5.31.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
terser (source)	5.31.3 -> 5.31.6

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Release Notes

terser/terser (terser)

### [`v5.31.6`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5316) [Compare Source](https://togithub.com/terser/terser/compare/v5.31.5...f9291ab450df4fc1e6b266e156856820b21f9c56) - Retain side effects in a `case` when the expression is a sequence (comma) expression ### [`v5.31.5`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5315) [Compare Source](https://togithub.com/terser/terser/compare/v5.31.4...v5.31.5) - Revert v5.31.4, which created mysterious issues [#​1548](https://togithub.com/terser/terser/issues/1548), [#​1549](https://togithub.com/terser/terser/issues/1549) ### [`v5.31.4`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5314) [Compare Source](https://togithub.com/terser/terser/compare/v5.31.3...v5.31.4) - drop_unused: drop classes which only have side effects in the `extends` part

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Configuration

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