fix(deps): update dependency helmet to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
helmet (source)	^5.1.1 -> ^6.0.0

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Release Notes

helmetjs/helmet

v6.0.0

Compare Source

Changed

• Breaking: helmet.contentSecurityPolicy no longer sets block-all-mixed-content directive by default
• Breaking: helmet.expectCt is no longer set by default. It can, however, be explicitly enabled. It will be removed in Helmet 7. See #​310
• Breaking: Increase TypeScript strictness around some arguments. Only affects TypeScript users, and may not require any code changes. See #​369
• helmet.frameguard no longer offers a specific error when trying to use ALLOW-FROM; it just says that it is unsupported. Only the error message has changed

Removed

• Breaking: Dropped support for Node 12 and 13. Node 14+ is now required

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