chore(deps): pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
@​types/dotenv	devDependencies	pin	^6.1.1 -> 6.1.1	source
@​types/express	devDependencies	pin	^4.16.1 -> 4.16.1	source
@​types/node-xlsx	devDependencies	pin	^0.12.1 -> 0.12.1	source
@​types/nodemailer	devDependencies	pin	^4.6.7 -> 4.6.7	source

:pushpin: Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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