chore(deps-dev): bump postcss from 8.2.5 to 8.2.6

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.5 to 8.2.6.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.2.5...8.2.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package-lock.json

@@ -7582,9 +7582,9 @@
       }
     },
     "postcss": {
-      "version": "8.2.5",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.5.tgz",
-      "integrity": "sha512-wMcb7BpDcm3gxQOQx46NDNT36Kk0Ao6PJLLI2ed5vehbbbxCEuslSQzbQ2sfSKy+gkYxhWcGWSeaK+gwm4KIZg==",
+      "version": "8.2.6",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.6.tgz",
+      "integrity": "sha512-xpB8qYxgPuly166AGlpRjUdEYtmOWx2iCwGmrv4vqZL9YPVviDVPZPRXxnXr6xPZOdxQ9lp3ZBFCRgWJ7LE3Sg==",
       "dev": true,
       "requires": {
         "colorette": "^1.2.1",

package.json

@@ -58,7 +58,7 @@
     "cypress": "^6.4.0",
     "dagre": "^0.8.5",
     "localforage": "^1.9.0",
-    "postcss": "^8.2.5",
+    "postcss": "^8.2.6",
     "postcss-cli": "^8.3.1",
     "postcss-nested": "^5.0.3",
     "prettier": "2.2.1",