chore: Update dependency helmet to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
helmet (source)	7.2.0 -> 8.1.0

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Release Notes

helmetjs/helmet (helmet)

v8.1.0

Compare Source

Changed

• Content-Security-Policy gives a better error when a directive value, like self, should be quoted. See #​482

v8.0.0

Compare Source

Changed

• Breaking: Strict-Transport-Security now has a max-age of 365 days, up from 180
• Breaking: Content-Security-Policy middleware now throws an error if a directive should have quotes but does not, such as self instead of 'self'. See #​454
• Breaking: Content-Security-Policy's getDefaultDirectives now returns a deep copy. This only affects users who were mutating the result
• Breaking: Strict-Transport-Security now throws an error when "includeSubDomains" option is misspelled. This was previously a warning

Removed

• Breaking: Drop support for Node 16 and 17. Node 18+ is now required

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