Update some packages to fix a bug.

https://github.com/gatsbyjs/gatsby/issues/17865\#issuecomment-612886060

package.json

@@ -41,10 +41,10 @@
         "gatsby-image": "^2.11.0",
         "gatsby-plugin-feed": "^2.13.1",
         "gatsby-plugin-manifest": "^2.12.1",
-        "gatsby-plugin-no-sourcemaps": "^3.0.0",
+        "gatsby-plugin-no-sourcemaps": "^3.1.0",
         "gatsby-plugin-offline": "^3.10.2",
         "gatsby-plugin-purgecss": "^5.0.0",
-        "gatsby-plugin-react-helmet": "^3.10.0",
+        "gatsby-plugin-react-helmet": "^4.1.0",
         "gatsby-plugin-sass": "^2.8.0",
         "gatsby-plugin-sharp": "^2.14.3",
         "gatsby-remark-copy-linked-files": "^2.10.0",
@@ -58,17 +58,17 @@
         "prismjs": "^1.23.0",
         "react": "^16.14.0",
         "react-dom": "^16.14.0",
-        "react-helmet": "^5.2.1",
+        "react-helmet": "^6.1.0",
         "sass": "^1.32.8"
     },
     "devDependencies": {
         "babel-jest": "^26.6.3",
-        "babel-preset-gatsby": "^1.0.0",
-        "cypress": "^6.6.0",
+        "babel-preset-gatsby": "^1.1.0",
+        "cypress": "^6.8.0",
         "identity-obj-proxy": "^3.0.0",
         "jest": "^26.6.3",
         "prettier": "^2.2.1",
-        "react-test-renderer": "^17.0.1",
-        "start-server-and-test": "^1.12.0"
+        "react-test-renderer": "^17.0.2",
+        "start-server-and-test": "^1.12.1"
     }
 }