Update dependency mongoose to v5.12.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mongoose (source)	5.12.14 -> 5.12.15

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Release Notes

Automattic/mongoose

v5.12.15

Compare Source

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• fix(index.d.ts): add extra TInstanceMethods generic param to Schema for cases when we can't infer from Model #​10358
• fix(index.d.ts): added typings for near() in model aggregation #​10373 tbhaxor
• fix(index.d.ts): correct function signature for Query#cast() #​10388 lkho
• docs(transactions): add import statement #​10365 JimLynchCodes
• docs(schema): add missing discriminatorKey schema option #​10386 #​10376 IslandRhythms
• docs(index.d.ts): fix typo #​10363 houssemchebeb

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