fix(deps): update dependency gatsby-plugin-emotion to v5

Author: renovate-bot

package-lock.json

@@ -46,7 +46,7 @@
     "@travi/travi.org-theme-components": "1.2.0",
     "gatsby": "2.20.17",
     "gatsby-image": "2.3.2",
-    "gatsby-plugin-emotion": "4.2.1",
+    "gatsby-plugin-emotion": "5.4.0",
     "gatsby-plugin-google-fonts": "1.0.1",
     "gatsby-plugin-manifest": "2.3.3",
     "gatsby-plugin-material-ui": "2.1.10",