fix(deps): update dependency mongoose to v8.20.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mongoose (source)	8.20.1 -> 8.20.4

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Release Notes

Automattic/mongoose (mongoose)

v8.20.4

Compare Source

8.20.4 / 2025-12-18

• fix(model): ensure $isDeleted is set after calling doc.deleteOne() successfully #​15898
• fix(document): use bitwise OR to accumulate version mode flags #​15893 #​15888 AbdelrahmanHafez

v8.20.3

Compare Source

===================

• perf: use Object.hasOwn instead of Object#hasOwnProperty #​15875 AbdelrahmanHafez
• fix: improve error when calling Document.prototype.init() with null/undefined #​15812 Vegapunk-debug
• types(schema): avoid treating paths with default: null as required #​15889
• types(schema): allow partial statics to schema.statics() #​15780

v8.20.2

Compare Source

===================

• fix(model): bump version if necessary after successful bulkSave() #​15809 #​15800
• fix(bulkWrite): pass overwriteImmutable option to castUpdate fixes #​15789 #​15782 #​15781
• types(schema): allow calling schema.static() with as TStatics #​15794 #​15780

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