Update definitelyTyped

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@types/chai	devDependencies	minor	^4.1.7 -> ^4.2.3
@types/dirty-chai	devDependencies	patch	^2.0.0 -> ^2.0.2
@types/node	devDependencies	minor	^12.6.2 -> ^12.7.11
@types/nodemailer	devDependencies	patch	^6.2.0 -> ^6.2.1
@types/smtp-server	devDependencies	patch	^3.5.1 -> ^3.5.2

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[coveralls]

Coverage remained the same at 71.831% when pulling 65c1cdc on renovate/definitelytyped into 3df18f5 on master.