Bump github.com/go-sql-driver/mysql from 1.7.1 to 1.8.1

Bumps github.com/go-sql-driver/mysql from 1.7.1 to 1.8.1.

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updated-dependencies:

• dependency-name: github.com/go-sql-driver/mysql dependency-type: direct:production update-type: version-update:semver-minor

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