fix(gatsby-plugin-feed): Exists function and update version fs-extra (#…

…29616) (#29764)

Co-authored-by: Hector Alcazar <halcaza@US-C02DKA1XMD6M>
Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>
(cherry picked from commit 5fb6064)

Co-authored-by: hiad <hiad99@gmail.com>

packages/gatsby-plugin-feed/package.json

@@ -10,7 +10,7 @@
     "@babel/runtime": "^7.12.5",
     "@hapi/joi": "^15.1.1",
     "common-tags": "^1.8.0",
-    "fs-extra": "^8.1.0",
+    "fs-extra": "^9.1.0",
     "gatsby-plugin-utils": "^0.9.0",
     "lodash.merge": "^4.6.2",
     "rss": "^1.2.2"

packages/gatsby-plugin-feed/src/gatsby-node.js

@@ -59,7 +59,7 @@ exports.onPostBuild = async ({ graphql }, pluginOptions) => {
 
     const outputPath = path.join(publicPath, feed.output)
     const outputDir = path.dirname(outputPath)
-    if (!(await fs.exists(outputDir))) {
+    if (!(await fs.pathExists(outputDir))) {
       await fs.mkdirp(outputDir)
     }
     await fs.writeFile(outputPath, rssFeed.xml())