fix(starters): update dependency gatsby-plugin-offline to ^2.1.3 (#14756)

Author: renovate[bot]

starters/blog/package-lock.json

@@ -13,7 +13,7 @@
     "gatsby-plugin-feed": "^2.2.3",
     "gatsby-plugin-google-analytics": "^2.0.21",
     "gatsby-plugin-manifest": "^2.1.1",
-    "gatsby-plugin-offline": "^2.1.2",
+    "gatsby-plugin-offline": "^2.1.3",
     "gatsby-plugin-react-helmet": "^3.0.12",
     "gatsby-plugin-sharp": "^2.1.5",
     "gatsby-plugin-typography": "^2.2.13",

starters/blog/package.json

@@ -8,7 +8,7 @@
     "gatsby": "^2.9.2",
     "gatsby-image": "^2.1.4",
     "gatsby-plugin-manifest": "^2.1.1",
-    "gatsby-plugin-offline": "^2.1.2",
+    "gatsby-plugin-offline": "^2.1.3",
     "gatsby-plugin-react-helmet": "^3.0.12",
     "gatsby-plugin-sharp": "^2.1.5",
     "gatsby-source-filesystem": "^2.0.39",