Update dependency mysql2 to v3.15.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mysql2 (source)	3.15.1 -> 3.15.3

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Release Notes

sidorares/node-mysql2 (mysql2)

v3.15.3

Compare Source

Bug Fixes

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

v3.15.2

Compare Source

Bug Fixes

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

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