chore(deps): update dependency mongoose to v8.9.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mongoose (source)	8.9.3 -> 8.9.4

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Release Notes

Automattic/mongoose (mongoose)

v8.9.4

Compare Source

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

• fix(document): fix document not applying manual populate when using a function in schema.options.ref #​15138 IchirokuXVI
• fix(model): make Model.validate() static correctly cast document arrays #​15169 #​15164
• fix(model): allow passing validateBeforeSave option to bulkSave() to skip validation #​15161 #​15156
• fix(schema): allow multiple self-referencing discriminator schemas using Schema.prototype.discriminator #​15142 #​15120
• types: avoid BufferToBinary<> wiping lean types when passed to generic functions #​15160 #​15158
• docs: fix <code> in header ids #​15159
• docs: fix header in field-level-encryption.md #​15137 damieng

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