fix: update dependency postcss to v8 (#7)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

package.json

@@ -25,7 +25,7 @@
   "devDependencies": {
     "@dword-design/base": "^7.0.0",
     "@dword-design/functions": "^2.7.2",
-    "postcss": "^7.0.27"
+    "postcss": "^8.0.0"
   },
   "publishConfig": {
     "access": "public"

yarn.lock

@@ -3004,8 +3004,9 @@ depcheck-parser-babel@^1.2.0:
     "@babel/core" "^7.7.7"
     fs-extra "^9.0.0"
 
-"depcheck@github:dword-design/depcheck#fork":
+depcheck@dword-design/depcheck#fork:
   version "0.0.1"
+  uid "8a9eb41006c2c6f9cbd79e4e68bf265e1c1df1dc"
   resolved "https://codeload.github.com/dword-design/depcheck/tar.gz/8a9eb41006c2c6f9cbd79e4e68bf265e1c1df1dc"
   dependencies:
     "@babel/parser" "^7.8.4"
@@ -6124,7 +6125,7 @@ mute-stream@~0.0.4:
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.8.tgz#1630c42b2251ff81e2a283de96a5497ea92e5e0d"
   integrity sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==
 
-nanoid@3.1.20:
+nanoid@3.1.20, nanoid@^3.1.20:
   version "3.1.20"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.20.tgz#badc263c6b1dcf14b71efaa85f6ab4c1d6cfc788"
   integrity sha512-a1cQNyczgKbLX9jwbS/+d7W8fX/RfgYR7lVWwWOGIPNgK2m0MWvrGF6/m4kk6U3QcFMnZf3RIhL0v2Jgh/0Uxw==
@@ -7145,7 +7146,7 @@ postcss-custom-unit@^1.0.0:
     "@jsmini/extend" "^0.3.1"
     postcss "^7.0.6"
 
-postcss@^7.0.27, postcss@^7.0.6:
+postcss@^7.0.6:
   version "7.0.35"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.35.tgz#d2be00b998f7f211d8a276974079f2e92b970e24"
   integrity sha512-3QT8bBJeX/S5zKTTjTCIjRF3If4avAT6kqxcASlTWEtAFCb9NH0OUxNDfgZSWdP5fJnBYCMEWkIFfWeugjzYMg==
@@ -7154,6 +7155,15 @@ postcss@^7.0.27, postcss@^7.0.6:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
+postcss@^8.0.0:
+  version "8.2.6"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.6.tgz#5d69a974543b45f87e464bc4c3e392a97d6be9fe"
+  integrity sha512-xpB8qYxgPuly166AGlpRjUdEYtmOWx2iCwGmrv4vqZL9YPVviDVPZPRXxnXr6xPZOdxQ9lp3ZBFCRgWJ7LE3Sg==
+  dependencies:
+    colorette "^1.2.1"
+    nanoid "^3.1.20"
+    source-map "^0.6.1"
+
 prelude-ls@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"