chore(deps): update dependency css-loader to v6 (#798)

Author: renovate[bot]

legacy/package.json

@@ -14,7 +14,7 @@
     "@vue/test-utils": "1.3.0",
     "@vue/vue2-jest": "27.0.0-alpha.4",
     "babel-jest": "27.5.1",
-    "css-loader": "0.28.11",
+    "css-loader": "6.7.1",
     "jest": "27.5.1",
     "vue": "2.6.14",
     "vue-template-compiler": "2.6.14"