Update dependency helmet to v5.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
helmet	5.1.0 -> 5.1.1

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Release Notes

helmetjs/helmet

v5.1.1

Compare Source

Changed

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

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Configuration

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