Bump helmet from 4.2.0 to 4.3.1

[dependabot-preview[bot]]

Bumps helmet from 4.2.0 to 4.3.1.

Changelog

Sourced from helmet's changelog.

4.3.1 - 2020-12-27

Fixed

• helmet.contentSecurityPolicy: broken TypeScript types. See #283

4.3.0 - 2020-12-27

Added

• helmet.contentSecurityPolicy: setting the default-src to helmet.contentSecurityPolicy.dangerouslyDisableDefaultSrc disables it

Changed

• helmet.frameguard: slightly improved error messages for non-strings

Commits

• 042ee40 4.3.1
• 41e0947 Update changelog for 4.3.1 release
• 5ca9792 Content-Security-Policy 3.3.1
• f1afeb9 Fix TypeScript error
• 08b5f46 Stop double-running CI jobs
• 4a721ec 4.3.0
• 471400a Update changelog for 4.3.0 release
• c6f4ba5 Content-Security-Policy 3.3.0
• f4520bb Switch to GitHub Actions for CI
• e1c989e Update devDependencies to latest versions
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like helmet is up-to-date now, so this is no longer needed.