Update dependency simple-line-icons to v2.5.4

Author: renovate-bot

template/package.json

@@ -25,7 +25,7 @@
     "express": "4.17.1",
     "mdi": "2.2.43",
     "nuxt": "2.13.0",
-    "simple-line-icons": "2.4.1",
+    "simple-line-icons": "2.5.4",
     "vue-chartjs": "3.5.0",
     "vue-echarts": "4.1.0",
     "vue-md-date-picker": "1.0.16"