mod: bump github.com/go-sql-driver/mysql from 1.4.0 to 1.6.0

[dependabot]

Bumps github.com/go-sql-driver/mysql from 1.4.0 to 1.6.0.

Release notes

Sourced from github.com/go-sql-driver/mysql's releases.

Version 1.6.0

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

Version 1.5.0

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

Version 1.4.1

Bugfix release

• Several fixes of the authentication handling
• Fix TIME format for binary columns
• Fix canceled context broke mysqlConn

See CHANGELOG.md for full details

Changelog

Sourced from github.com/go-sql-driver/mysql's changelog.

Version 1.6 (2021-04-01)

Changes:

• 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)

New Features:

• Implement driver.Validator interface (#1106, #1174)
• Support returning uint64 from Valuer in ConvertValue (#1143)
• Add json.RawMessage for converter and prepared statement (#1059)
• Interpolate json.RawMessage as string (#1058)
• Implements CheckNamedValue (#1090)

Bugfixes:

• Stop rounding times (#1121, #1172)
• Put zero filler into the SSL handshake packet (#1066)
• Fix checking cancelled connections back into the connection pool (#1095)
• Fix remove last 0 byte for mysql_old_password when password is empty (#1133)

Version 1.5 (2020-01-07)

Changes:

• Dropped support Go 1.9 and lower (#823, #829, #886, #1016, #1017)
• Improve buffer handling (#890)
• Document potentially insecure TLS configs (#901)
• Use a double-buffering scheme to prevent data races (#943)
• Pass uint64 values without converting them to string (#838, #955)
• Update collations and make utf8mb4 default (#877, #1054)
• Make NullTime compatible with sql.NullTime in Go 1.13+ (#995)
• Removed CloudSQL support (#993, #1007)
• Add Go Module support (#1003)

New Features:

• Implement support of optional TLS (#900)
• Check connection liveness (#934, #964, #997, #1048, #1051, #1052)
• Implement Connector Interface (#941, #958, #1020, #1035)

Bugfixes:

• Mark connections as bad on error during ping (#875)
• Mark connections as bad on error during dial (#867)

... (truncated)

Commits

• bcc459a Release v1.6.0 (#1197)
• e246959 add Go 1.16 to the build matrix (#1198)
• 3326742 Implement driver.Validator interface (#1174)
• 7b629a9 handling decoding pem error (#1192)
• fe2230a stop rounding times (#1172)
• 4d5208a improve GitHub Actions workflows (#1190)
• a341cd1 Move tests from Travis to Actions (#1183)
• f6dcc3d Fix go vet error (#1173)
• aae55f7 README: Make usage code more friendly (#1170)
• cf72fd2 Fix a broken link to cleartext client side plugin (#1165)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #26 (cb20779) into main (d64162e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #26   +/-   ##
=======================================
  Coverage   77.61%   77.61%           
=======================================
  Files           9        9           
  Lines         621      621           
=======================================
  Hits          482      482           
  Misses         78       78           
  Partials       61       61