deps: replace node-sass package with sass

The node-sass package will not support Apple M1 processors

Author: jamaljsr

app/package.json

@@ -21,7 +21,7 @@
     "@emotion/styled": "11.3.0",
     "@improbable-eng/grpc-web": "0.14.0",
     "big.js": "6.1.1",
-    "bootstrap": "4.5.0",
+    "bootstrap": "4.6.1",
     "copy-to-clipboard": "3.3.1",
     "d3": "6.3.1",
     "date-fns": "2.14.0",
@@ -81,8 +81,8 @@
     "google-protobuf": "3.12.2",
     "jest-canvas-mock": "2.3.0",
     "jest-environment-jsdom-sixteen": "1.0.3",
-    "node-sass": "4.14.1",
     "prettier": "2.1.2",
+    "sass": "1.43.4",
     "ts-protoc-gen": "0.12.0",
     "typescript": "4.1.6"
   },