Update dependency gatsby-plugin-robots-txt to v1.6.9

Author: renovate-bot

package.json

@@ -26,7 +26,7 @@
     "gatsby-plugin-mdx": "2.8.0",
     "gatsby-plugin-page-creator": "3.8.0",
     "gatsby-plugin-react-helmet": "4.8.0",
-    "gatsby-plugin-robots-txt": "1.6.8",
+    "gatsby-plugin-robots-txt": "1.6.9",
     "gatsby-plugin-sass": "4.8.0",
     "gatsby-plugin-sharp": "3.8.0",
     "gatsby-plugin-sitemap": "4.4.0",

yarn.lock

@@ -6393,10 +6393,10 @@ gatsby-plugin-react-helmet@4.8.0:
   dependencies:
     "@babel/runtime" "^7.14.0"
 
-gatsby-plugin-robots-txt@1.6.8:
-  version "1.6.8"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-robots-txt/-/gatsby-plugin-robots-txt-1.6.8.tgz#28968ca767ac4e45bf71b18eb1d363abb55aa6cd"
-  integrity sha512-Lw/r+gBbjvCiVnqJaO24aBUFO0VMZMHgKupy/LLzxxVE8OuEbTpwUv2aYZvtOZIXnKJfdbf/Znu43t7qAp5sdw==
+gatsby-plugin-robots-txt@1.6.9:
+  version "1.6.9"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-robots-txt/-/gatsby-plugin-robots-txt-1.6.9.tgz#579d18550de1672098aeeb3e6dd8b8f951f3c7a2"
+  integrity sha512-momZLUSGrNsLlbRuHYCD/ToEu8hXhVz80P4UYogsgp1/7IfP/TvSow3tQlb+dm65r0kEmrWgqcX39ZbuxUCPkQ==
   dependencies:
     "@babel/runtime" "^7.14.0"
     generate-robotstxt "^8.0.3"