Update dependency helmet to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
helmet (source)	^5.0.2 -> ^6.0.0

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Release Notes

helmetjs/helmet (helmet)

v6.2.0

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

v6.1.5

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Fixed

• Fixed yet another issue with TypeScript exports. See #​420

v6.1.4

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Fixed

• Fix another issue with TypeScript default exports. See #​418

v6.1.3

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Fixed

• Fix issue with TypeScript default exports. See #​417

v6.1.2

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Fixed

• Retored main to package to help with some build tools

v6.1.1

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Fixed

• Fixed missing package metadata

v6.1.0

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Changed

• Improve support for various TypeScript setups, including "nodenext". See #​405

v6.0.1

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Fixed

• crossOriginEmbedderPolicy did not accept options at the top level. See #​390

v6.0.0

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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

v5.1.1

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Changed

• Fix TypeScript bug with some TypeScript configurations. See #​375 and #​359

v5.1.0

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Added

• Cross-Origin-Embedder-Policy: support credentialless policy. See #​365
• Documented how to set both Content-Security-Policy and Content-Security-Policy-Report-Only

Changed

• Cleaned up some documentation around Origin-Agent-Cluster

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