Update dependency @types/react-helmet to v6.1.9

Author: renovate[bot]

package.json

@@ -42,7 +42,7 @@
     "@reach/router": "1.3.4",
     "@types/node": "8.10.61",
     "@types/reach__router": "1.3.6",
-    "@types/react-helmet": "6.1.0",
+    "@types/react-helmet": "6.1.9",
     "@types/reactstrap": "8.5.2",
     "gatsby-plugin-graphql-codegen": "2.7.1",
     "prettier": "2.1.2",

yarn.lock

@@ -1568,10 +1568,10 @@
     "@types/history" "*"
     "@types/react" "*"
 
-"@types/[email protected].0":
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/@types/react-helmet/-/react-helmet-6.1.0.tgz#af586ed685f4905e2adc7462d1d65ace52beee7a"
-  integrity sha512-PYRoU1XJFOzQ3BHvWL1T8iDNbRjdMDJMT5hFmZKGbsq09kbSqJy61uwEpTrbTNWDopVphUT34zUSVLK9pjsgYQ==
+"@types/[email protected].9":
+  version "6.1.9"
+  resolved "https://registry.yarnpkg.com/@types/react-helmet/-/react-helmet-6.1.9.tgz#e79e0def2ad4047cb67e83c5be7cfb3d2121615a"
+  integrity sha512-nuOeTefP4yPTWHvjGksCBKb/4hsgJxSX7aSTjTIDFXJIkZ6Wo2Y4/cmE1FO9OlYBrHjKOer/0zLwY7s4qiQBtw==
   dependencies:
     "@types/react" "*"