Update post-css

[LaseII]

Hello,

on consumer side of this package we run into issues with not synced post-css versions.

Unknown error from PostCSS plugin. Your current PostCSS version is 7.0.14, but postcss-modules-scope uses 6.0.23.

Not sure if that update could fix usage of electrons inside multiple css selctors. But can we give it a try ?

yarn list --pattern postcss              
yarn list v1.18.0
├─ @dx/[email protected]
│  └─ [email protected]
├─ @utilitycss/[email protected]
│  └─ [email protected]
├─ [email protected]
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yarn why postcss-modules-scope 
yarn why v1.18.0
[1/4] 🤔  Why do we have the module "postcss-modules-scope"...?
[2/4] 🚚  Initialising dependency graph...
[3/4] 🔍  Finding dependency...
[4/4] 🚡  Calculating file sizes...
=> Found "[email protected]"
info Reasons this module exists
   - "_project_#@utilitycss#atomic#postcss-modules#css-modules-loader-core" depends on it
   - Hoisted from "_project_#@utilitycss#atomic#postcss-modules#css-modules-loader-core#postcss-modules-scope"
   - Hoisted from "_project_#@dx#dev-ui#gatsby#css-loader#postcss-modules-scope"
info Disk size without dependencies: "816KB"
info Disk size with unique dependencies: "1.84MB"
info Disk size with transitive dependencies: "5.24MB"
info Number of shared dependencies: 18