Update JS dependencies (#12782)

- Update all dependencies
- Add explicit postcss dependency as dictated by postcss-loader
- Adapt for new postcss-loader syntax
- Move sourceMap options to top for consistency

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

package.json

@@ -10,29 +10,30 @@
     "@babel/preset-env": "7.11.5",
     "@babel/runtime": "7.11.2",
     "@claviska/jquery-minicolors": "2.3.5",
-    "@primer/octicons": "10.1.0",
+    "@primer/octicons": "11.0.0",
     "add-asset-webpack-plugin": "1.0.0",
     "babel-loader": "8.1.0",
     "clipboard": "2.0.6",
     "core-js": "3.6.5",
-    "css-loader": "4.2.2",
+    "css-loader": "4.3.0",
     "css-minimizer-webpack-plugin": "1.1.3",
     "dropzone": "5.7.2",
     "escape-goat": "3.0.0",
     "fast-glob": "3.2.4",
     "file-loader": "6.1.0",
-    "fomantic-ui": "2.8.6",
+    "fomantic-ui": "2.8.7",
     "font-awesome": "4.7.0",
     "jquery": "3.5.1",
     "jquery.are-you-sure": "1.9.0",
     "less": "3.12.2",
     "less-loader": "7.0.1",
     "license-webpack-plugin": "2.3.0",
-    "mermaid": "8.7.0",
-    "mini-css-extract-plugin": "0.11.0",
+    "mermaid": "8.8.0",
+    "mini-css-extract-plugin": "0.11.1",
     "monaco-editor": "0.20.0",
     "monaco-editor-webpack-plugin": "1.9.0",
-    "postcss-loader": "3.0.0",
+    "postcss": "7.0.32",
+    "postcss-loader": "4.0.1",
     "postcss-preset-env": "6.7.0",
     "raw-loader": "4.0.1",
     "sortablejs": "1.10.2",
@@ -47,8 +48,8 @@
     "webpack": "4.44.1",
     "webpack-cli": "3.3.12",
     "webpack-fix-style-only-entries": "0.5.1",
-    "workbox-routing": "5.1.3",
-    "workbox-strategies": "5.1.3",
+    "workbox-routing": "5.1.4",
+    "workbox-strategies": "5.1.4",
     "worker-loader": "3.0.2",
     "wrap-ansi": "7.0.0"
   },