Update dependency postcss-reporter to v7

Author: renovate-bot

package-lock.json

@@ -9,7 +9,7 @@
   "devDependencies": {
     "jest": "26.6.3",
     "postcss-cli": "8.3.0",
-    "postcss-reporter": "6.0.1",
+    "postcss-reporter": "7.0.2",
     "stylelint": "13.12.0",
     "stylelint-config-standard": "21.0.0",
     "supertest": "6.1.3"