chore(deps): update dependency mysql2 to 3.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mysql2 (source)	3.14 -> 3.15

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Release Notes

sidorares/node-mysql2 (mysql2)

v3.15.3

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Bug Fixes

• skip SNI for IP addresses in TLS connection (#​3835) (6000eb2)

v3.15.2

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Bug Fixes

• fix sha256_password to work correctly over a TLS connection (#​3809) (fb9eae1)

v3.15.1

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Bug Fixes

• typings: missing callback to PoolCluster.end() (#​3819) (53a9bc2)

v3.15.0

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Features

• gracefully end pool connections #​3148 (#​3776) (e72247f)

v3.14.5

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Bug Fixes

• types: restrict StreamOptions.objectMode to true (#​3686) (#​3784) (c091f1b)

v3.14.4

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Bug Fixes

• destroy connection when stream errors (#​3769) (cc34a83)
• fix backpressure when using TLS (#​1752) (64ea4cd)
• stream: resume connection when stream errors or is destroyed (#​3775) (9642a1e)

v3.14.3

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Bug Fixes

• resolve parser cache collision with dual typeCast connections (#​3644) (ce2ad75)

v3.14.2

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Bug Fixes

• pass columnType to readDateTimeString (#​3700) (1ee48cc)

v3.14.1

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Miscellaneous Chores

• release 3.14.1 (9d097f8)

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