chore(deps): update dependency mysql2 to v3.9.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mysql2 (source)	3.9.2 -> 3.9.7

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Release Notes

sidorares/node-mysql2 (mysql2)

v3.9.7

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Bug Fixes

• security: sanitize timezone parameter value to prevent code injection (#​2608) (7d4b098)

v3.9.6

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Bug Fixes

• binary parser sometimes reads out of packet bounds when results contain null and typecast is false (#​2601) (705835d)

v3.9.5

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Bug Fixes

• revert breaking change in results creation (#​2591) (f7c60d0)

v3.9.4

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Bug Fixes

• docs: improve the contribution guidelines (#​2552) (8a818ce)
• security: improve results object creation (#​2574) (4a964a3)
• security: improve supportBigNumbers and bigNumberStrings sanitization (#​2572) (74abf9e)

v3.9.3

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Bug Fixes

• security: improve cache key formation (#​2424) (0d54b0c)
  • Fixes a potential parser cache poisoning attack vulnerability reported by Vsevolod Kokorin (Slonser) of Solidlab
• update Amazon RDS SSL CA cert (#​2131) (d9dccfd)

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