chore(deps-dev): bump prettier from 2.3.0 to 2.3.1 in /microsite

Bumps [prettier](https://github.com/prettier/prettier) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.3.0...2.3.1)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

microsite/.npmrc

@@ -0,0 +1,2 @@
+registry=https://registry.npmjs.org/
+engine-strict=true

microsite/package.json

@@ -19,7 +19,7 @@
     "@spotify/prettier-config": "^10.0.0",
     "docusaurus": "^2.0.0-alpha.70",
     "js-yaml": "^4.1.0",
-    "prettier": "^2.3.0",
+    "prettier": "^2.3.1",
     "yarn-lock-check": "^1.0.4"
   },
   "prettier": "@spotify/prettier-config"

microsite/yarn.lock

@@ -5275,10 +5275,10 @@ prepend-http@^2.0.0:
   resolved "https://registry.npmjs.org/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
   integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
 
-prettier@^2.3.0:
-  version "2.3.0"
-  resolved "https://registry.npmjs.org/prettier/-/prettier-2.3.0.tgz#b6a5bf1284026ae640f17f7ff5658a7567fc0d18"
-  integrity sha512-kXtO4s0Lz/DW/IJ9QdWhAf7/NmPWQXkFr/r/WkR3vyI+0v8amTDxiaQSLzs8NBlytfLWX/7uQUMIW677yLKl4w==
+prettier@^2.3.1:
+  version "2.3.1"
+  resolved "https://registry.npmjs.org/prettier/-/prettier-2.3.1.tgz#76903c3f8c4449bc9ac597acefa24dc5ad4cbea6"
+  integrity sha512-p+vNbgpLjif/+D+DwAZAbndtRrR0md0MwfmOVN9N+2RgyACMT+7tfaRnT+WDPkqnuVwleyuBIG2XBxKDme3hPA==
 
 prismjs@^1.22.0:
   version "1.23.0"