[Snyk] Upgrade helmet from 3.21.3 to 3.23.3

[snyk-bot]

Snyk has created this PR to upgrade helmet from 3.21.3 to 3.23.3.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 6 versions ahead of your current version.
• The recommended version was released 2 years ago, on 2020-06-26.

Release notes

Package name: helmet

• 3.23.3 - 2020-06-26
  

  3.23.3

• 3.23.2 - 2020-06-23
  

  3.23.2

• 3.23.1 - 2020-06-16
  

  3.23.1

• 3.23.0 - 2020-06-12
  

  3.23.0

• 3.22.1 - 2020-06-10
  

  3.22.1

• 3.22.0 - 2020-03-24
  

  3.22.0

• 3.21.3 - 2020-02-24
  

  3.21.3

from helmet GitHub release notes

Commit messages

Package name: helmet

• 3edd5e1 3.23.3
• 8662052 Include expect-ct and x-frame-options in npm package
• 5c4a499 Update changelog for 3.23.3 release
• 35b3e6d Proofread of SECURITY.md
• 04d446c Update Jest and @ types/jest to their latest versions
• 7906601 Import X-Frame-Options (frameguard) middleware
• 837765d Minor formatting changes in license
• d03c555 Import Expect-CT (expect-ct) middleware
• 16243e6 3.23.2
• 223edeb Update changelog for 3.23.2 release
• 124e95e X-DNS-Prefetch-Control: remove redundant contributors from package
• 0510abf Update outdated devDependencies
• e933c28 Import X-DNS-Prefetch-Control (dns-prefetch-control) middleware
• b120eb4 3.23.1
• 978b402 Update changelog for 3.23.1 release
• 1b7dc4b ienoopen@1.1.1
• 13b496f Import X-Download-Options (ienoopen) middleware
• 53a0299 Remove Feature-Policy middleware from documentation, as it is deprecated
• d93cdb6 3.23.0
• e40318d Update changelog for 3.23.0 release
• e5d4aa1 Deprecate Feature-Policy
• da4b623 Update code of conduct
• 852abfc Jest should ignore files in /dist/
• 39a8292 Add `prepublishOnly` script

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