Update dependency helmet to v7.1.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
helmet (source)	7.0.0 -> 7.1.0

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Release Notes

helmetjs/helmet (helmet)

v7.1.0

Compare Source

Added

• helmet.crossOriginEmbedderPolicy now supports the unsafe-none directive. See #​477

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backend/yarn.lock

@@ -791,9 +791,9 @@ has@^1.0.3:
     function-bind "^1.1.1"
 
 helmet@^7.0.0:
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/helmet/-/helmet-7.0.0.tgz#ac3011ba82fa2467f58075afa58a49427ba6212d"
-  integrity sha512-MsIgYmdBh460ZZ8cJC81q4XJknjG567wzEmv46WOBblDb6TUd3z8/GhgmsM9pn8g2B80tAJ4m5/d3Bi1KrSUBQ==
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/helmet/-/helmet-7.1.0.tgz#287279e00f8a3763d5dccbaf1e5ee39b8c3784ca"
+  integrity sha512-g+HZqgfbpXdCkme/Cd/mZkV0aV3BZZZSugecH03kl38m/Kmdx8jKjBikpDj2cr+Iynv4KpYEviojNdTJActJAg==
 
 http-errors@2.0.0:
   version "2.0.0"