Update dependency helmet to v5.1.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
helmet (source)	5.0.1 -> 5.1.1

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Release Notes

helmetjs/helmet (helmet)

v5.1.1

Compare Source

Changed

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

v5.1.0

Compare Source

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

v5.0.2

Compare Source

Changed

• Improve imports for CommonJS and ECMAScript modules. See #​345
• Fixed some documentation

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