Update dependency helmet to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
helmet (source)	^6.1.5 -> ^7.0.0

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Release Notes

helmetjs/helmet

v7.0.0

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Changed

• Breaking: Cross-Origin-Embedder-Policy middleware is now disabled by default. See #​411

Removed

• Breaking: Drop support for Node 14 and 15. Node 16+ is now required
• Breaking: Expect-CT is no longer part of Helmet. If you still need it, you can use the expect-ct package. See #​378

v6.2.0

Compare Source

• Expose header names (e.g., strictTransportSecurity for the Strict-Transport-Security header, instead of hsts)
• Rework documentation

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