Bump postcss from 8.4.12 to 8.4.26 in /plugin

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.12 to 8.4.26.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.12...8.4.26)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

plugin/package.json

@@ -31,7 +31,7 @@
     "less": "^3.12.2",
     "less-loader": "^7.0.2",
     "mini-css-extract-plugin": "^1.2.1",
-    "postcss": "^8.2.13",
+    "postcss": "^8.4.26",
     "postcss-less": "^4.0.0",
     "postcss-loader": "^4.0.4",
     "style-loader": "^2.0.0",

plugin/yarn.lock

@@ -2071,9 +2071,10 @@ [email protected]:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
 
-nanoid@^3.3.1:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.1.tgz#6347a18cac88af88f58af0b3594b723d5e99bb35"
+nanoid@^3.3.6:
+  version "3.3.6"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.6.tgz#443380c856d6e9f9824267d960b4236ad583ea4c"
+  integrity sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==
 
 native-request@^1.0.5:
   version "1.1.0"
@@ -2279,11 +2280,12 @@ postcss-value-parser@^4.1.0, postcss-value-parser@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz#723c09920836ba6d3e5af019f92bc0971c02e514"
 
-postcss@^8.1.2, postcss@^8.2.13, postcss@^8.2.15:
-  version "8.4.12"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.12.tgz#1e7de78733b28970fa4743f7da6f3763648b1905"
+postcss@^8.1.2, postcss@^8.2.15, postcss@^8.4.26:
+  version "8.4.26"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.26.tgz#1bc62ab19f8e1e5463d98cf74af39702a00a9e94"
+  integrity sha512-jrXHFF8iTloAenySjM/ob3gSj7pCu0Ji49hnjqzsgSRa50hkWCKD0HQ+gMNJkW38jBI68MpAAg7ZWwHwX8NMMw==
   dependencies:
-    nanoid "^3.3.1"
+    nanoid "^3.3.6"
     picocolors "^1.0.0"
     source-map-js "^1.0.2"