Update NPM dependencies

Updated:
- autoprefixer v10.3.7 → v10.4.0
- browser-sync v2.26.13 → v2.27.7
- esbuild v0.13.4 → v0.13.12
- postcss v8.3.9 → v8.3.11

package.json

@@ -21,14 +21,14 @@
         "svg4everybody": "^2.1.9"
     },
     "devDependencies": {
-        "autoprefixer": "^10.3.7",
-        "browser-sync": "^2.26.13",
+        "autoprefixer": "^10.4.0",
+        "browser-sync": "^2.27.7",
         "concat": "^1.0.3",
-        "esbuild": "^0.13.4",
+        "esbuild": "^0.13.12",
         "kleur": "^4.1.4",
         "node-notifier": "^10.0.0",
         "node-sass": "^6.0.1",
-        "postcss": "^8.3.9",
+        "postcss": "^8.3.11",
         "svg-mixer": "^2.3.14",
         "tiny-glob": "^0.2.9"
     }