Update dependency postcss to v8.5.16 (#322)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

client/package.json

@@ -69,7 +69,7 @@
   },
   "overrides": {
     "semver": "7.8.5",
-    "postcss": "8.5.14",
+    "postcss": "8.5.16",
     "ng2-dragula": {
       "@angular/common": "$@angular/common",
       "@angular/core": "$@angular/core",