Update dependency mysql to ^2.18.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mysql	^2.16.0 -> ^2.18.1

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Release Notes

mysqljs/mysql

v2.18.1

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• Fix Amazon RDS profile for yaSSL MySQL servers with 2019 CA #​2292

v2.18.0

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• Add localInfile option to control LOAD DATA LOCAL INFILE
• Add new Amazon RDS Root 2019 CA to Amazon RDS SSL profile #​2280
• Add new error codes up to MySQL 5.7.29
• Fix early detection of bad callback to connection.query
• Support Node.js 12.x #​2211
• Support Node.js 13.x
• Support non-enumerable properties in object argument to connection.query #​2253
• Update bignumber.js to 9.0.0
• Update readable-stream to 2.3.7

v2.17.1

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• Update bignumber.js to 7.2.1 #​2206
  • Fix npm deprecation warning

v2.17.0

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• Add reverse type lookup for small performance gain #​2170
• Fix connection.threadId missing on handshake failure
• Fix duplicate packet name in debug output
• Fix no password support for old password protocol
• Remove special case for handshake in determine packet code
• Small performance improvement starting command sequence
• Support auth switch in change user flow #​1776
• Support Node.js 11.x
• Update bignumber.js to 6.0.0

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