chore(deps): update dependency mysql2 to v3.9.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mysql2 (source)	3.9.8 -> 3.9.9

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Release Notes

sidorares/node-mysql2 (mysql2)

### [`v3.9.9`](https://togithub.com/sidorares/node-mysql2/blob/HEAD/Changelog.md#399-2024-05-29) [Compare Source](https://togithub.com/sidorares/node-mysql2/compare/v3.9.8...v3.9.9) ##### Bug Fixes - **connection config:** remove keepAliveInitialDelay default value ([#​2712](https://togithub.com/sidorares/node-mysql2/issues/2712)) ([688ebab](https://togithub.com/sidorares/node-mysql2/commit/688ebab84961ae82863f811fa772cfd26fbadc0e))

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