Update dependency postcss to ^8.1.7

Author: renovate-bot

package.json

@@ -34,7 +34,7 @@
     "chai": "^4.2.0",
     "eslint": "^7.13.0",
     "mocha": "^8.2.1",
-    "postcss": "^8.1.6",
+    "postcss": "^8.1.7",
     "prettier": "^2.1.2",
     "puppeteer": "^5.4.1",
     "tailwindcss": "^1.9.6"

yarn.lock

@@ -2107,7 +2107,7 @@ postcss@^7.0.11, postcss@^7.0.18, postcss@^7.0.32:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
-postcss@^8.1.6:
+postcss@^8.1.7:
   version "8.1.7"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.1.7.tgz#ff6a82691bd861f3354fd9b17b2332f88171233f"
   integrity sha512-llCQW1Pz4MOPwbZLmOddGM9eIJ8Bh7SZ2Oj5sxZva77uVaotYDsYTch1WBTNu7fUY0fpWp0fdt7uW40D4sRiiQ==