chore: Upgrade postcss to 8.4.49 (#106)

Upgrades postcss to 8.4.49. Tested on FF and Chrome all is working.

Closes https://github.com/codecov/internal-issues/issues/1103

Author: spalmurray-codecov

package-lock.json

@@ -38,7 +38,7 @@
     "autoprefixer": "^10.4.14",
     "copy-webpack-plugin": "^9.0.1",
     "css-loader": "^6.7.3",
-    "postcss": "^8.4.21",
+    "postcss": "^8.4.49",
     "postcss-loader": "^7.0.2",
     "prettier": "^2.2.1",
     "style-loader": "^3.3.1",