Update module github.com/go-sql-driver/mysql to v1.6.0

[bliuchak]

This PR contains the following updates:

Package	Type	Update	Change
github.com/go-sql-driver/mysql	require	minor	v1.4.1 -> v1.6.0

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Release Notes

go-sql-driver/mysql

v1.6.0

Compare Source

Major Release

• Migrate the CI service from travis-ci to GitHub Actions (#​1176, #​1183, #​1190)
• NullTime is deprecated (#​960, #​1144)
• Reduce allocations when building SET command (#​1111)
• Performance improvement for time formatting (#​1118)
• Performance improvement for time parsing (#​1098, #​1113)

See CHANGELOG.md for full details

v1.5.0

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Major Release

• Added Go Module support
• Dropped support for Go 1.9 and lower
• Implemented Connector interface
• Improved buffering
• Added connection liveness check
• Improved marking of bad connnections
• Updated collations and made utf8mb4 default
• Made mysql.NullTime compatible with sql.NullTime
• Removed support for CloudSQL via appengine/cloudsql

See CHANGELOG.md for full details

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