chore(deps): update dependency mongoose to v8.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mongoose (source)	8.9.0 -> 8.9.1

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Release Notes

Automattic/mongoose (mongoose)

v8.9.1

Compare Source

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

• fix(connection): remove heartbeat check in load balanced mode #​15089 #​15042 #​14812
• fix(discriminator): gather childSchemas when creating discriminator to ensure $getAllSubdocs() can properly get all subdocs #​15099 #​15088 #​15092
• fix(model): handle discriminators in castObject() #​15096 #​15075
• fix(schema): throw error if duplicate index definition using unique in schema path and subsequent .index() call #​15093 #​15056
• fix: mark documents that are populated using hydratedPopulatedDocs option as populated in top-level doc #​15080 #​15048
• fix(document+schema): improve error message for get() on invalid path #​15098 #​15071
• docs: remove more callback doc references & some small other changes #​15095

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