Update dependency mongoose to v8.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mongoose (source)	8.20.4 -> 8.21.0

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Release Notes

Automattic/mongoose (mongoose)

v8.21.0

Compare Source

8.21.0 / 2025-12-29

• feat(document): add support for getAtomics() to allow custom container types to utilize atomics #​15817
• feat(document+model): pass options to pre('deleteOne') and update+options to pre('updateOne') hooks #​15908 #​15870
• fix: add support for typescript style enums #​15914 #​15913 mjfwebb

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