Update dependency react-helmet to v6

package.json

@@ -18,7 +18,7 @@
     "gatsby-plugin-styled-components": "3.0.5",
     "react": "16.8.2",
     "react-dom": "16.8.2",
-    "react-helmet": "5.2.0",
+    "react-helmet": "6.1.0",
     "react-spring": "8.0.7",
     "styled-components": "4.1.3"
   },

yarn.lock

@@ -3591,11 +3591,6 @@ execa@^1.0.0:
     signal-exit "^3.0.0"
     strip-eof "^1.0.0"
 
-exenv@^1.2.1:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/exenv/-/exenv-1.2.2.tgz#2ae78e85d9894158670b03d47bec1f03bd91bb9d"
-  integrity sha1-KueOhdmJQVhnCwPUe+wfA72Ru50=
-
 expand-brackets@^0.1.4:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/expand-brackets/-/expand-brackets-0.1.5.tgz#df07284e342a807cd733ac5af72411e581d1177b"
@@ -7428,7 +7423,7 @@ promise@^7.1.1:
   dependencies:
     asap "~2.0.3"
 
-prop-types@^15.5.4:
+prop-types@^15.5.4, prop-types@^15.7.2:
   version "15.7.2"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.2.tgz#52c41e75b8c87e72b9d9360e0206b99dcbffa6c5"
   integrity sha512-8QQikdH7//R2vurIJSutZ1smHYTcLpRWEOlHnzcWHmBYrOGUysKwSsrC89BCiFj3CbrfJ/nXFdJepOVrY1GCHQ==
@@ -7638,15 +7633,20 @@ react-error-overlay@^3.0.0:
   resolved "https://registry.yarnpkg.com/react-error-overlay/-/react-error-overlay-3.0.0.tgz#c2bc8f4d91f1375b3dad6d75265d51cd5eeaf655"
   integrity sha512-XzgvowFrwDo6TWcpJ/WTiarb9UI6lhA4PMzS7n1joK3sHfBBBOQHUc0U4u57D6DWO9vHv6lVSWx2Q/Ymfyv4hw==
 
-react-helmet@5.2.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/react-helmet/-/react-helmet-5.2.0.tgz#a81811df21313a6d55c5f058c4aeba5d6f3d97a7"
-  integrity sha1-qBgR3yExOm1VxfBYxK66XW89l6c=
+react-fast-compare@^3.1.1:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/react-fast-compare/-/react-fast-compare-3.2.0.tgz#641a9da81b6a6320f270e89724fb45a0b39e43bb"
+  integrity sha512-rtGImPZ0YyLrscKI9xTpV8psd6I8VAtjKCzQDlzyDvqJA8XOW78TXYQwNRNd8g8JZnDu8q9Fu/1v4HPAVwVdHA==
+
+react-helmet@6.1.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/react-helmet/-/react-helmet-6.1.0.tgz#a750d5165cb13cf213e44747502652e794468726"
+  integrity sha512-4uMzEY9nlDlgxr61NL3XbKRy1hEkXmKNXhjbAIOVw5vcFrsdYbH2FEwcNyWvWinl103nXgzYNlns9ca+8kFiWw==
   dependencies:
-    deep-equal "^1.0.1"
     object-assign "^4.1.1"
-    prop-types "^15.5.4"
-    react-side-effect "^1.1.0"
+    prop-types "^15.7.2"
+    react-fast-compare "^3.1.1"
+    react-side-effect "^2.1.0"
 
 react-hot-loader@^4.6.2:
   version "4.6.5"
@@ -7673,13 +7673,10 @@ react-lifecycles-compat@^3.0.4:
   resolved "https://registry.yarnpkg.com/react-lifecycles-compat/-/react-lifecycles-compat-3.0.4.tgz#4f1a273afdfc8f3488a8c516bfda78f872352362"
   integrity sha512-fBASbA6LnOU9dOU2eW7aQ8xmYBSXUIWr+UmF9b1efZBazGNO+rcXT/icdKnYm2pTwcRylVUYwW7H1PHfLekVzA==
 
-react-side-effect@^1.1.0:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/react-side-effect/-/react-side-effect-1.1.5.tgz#f26059e50ed9c626d91d661b9f3c8bb38cd0ff2d"
-  integrity sha512-Z2ZJE4p/jIfvUpiUMRydEVpQRf2f8GMHczT6qLcARmX7QRb28JDBTpnM2g/i5y/p7ZDEXYGHWg0RbhikE+hJRw==
-  dependencies:
-    exenv "^1.2.1"
-    shallowequal "^1.0.1"
+react-side-effect@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/react-side-effect/-/react-side-effect-2.1.0.tgz#1ce4a8b4445168c487ed24dab886421f74d380d3"
+  integrity sha512-IgmcegOSi5SNX+2Snh1vqmF0Vg/CbkycU9XZbOHJlZ6kMzTmi3yc254oB1WCkgA7OQtIAoLmcSFuHTc/tlcqXg==
 
 react-spring@8.0.7:
   version "8.0.7"
@@ -8266,7 +8263,7 @@ shallow-compare@^1.2.2:
   resolved "https://registry.yarnpkg.com/shallow-compare/-/shallow-compare-1.2.2.tgz#fa4794627bf455a47c4f56881d8a6132d581ffdb"
   integrity sha512-LUMFi+RppPlrHzbqmFnINTrazo0lPNwhcgzuAXVVcfy/mqPDrQmHAyz5bvV0gDAuRFrk804V0HpQ6u9sZ0tBeg==
 
-shallowequal@^1.0.1, shallowequal@^1.0.2:
+shallowequal@^1.0.2:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/shallowequal/-/shallowequal-1.1.0.tgz#188d521de95b9087404fd4dcb68b13df0ae4e7f8"
   integrity sha512-y0m1JoUZSlPAjXVtPPW70aZWfIL/dSP7AFkRnniLCrK/8MDKog3TySTBmckD+RObVxH0v4Tox67+F14PdED2oQ==