refactor(luxon): Plugin CloudBuild - Swapped over from using moment to luxon

Signed-off-by: Harry Hogg <hhogg@spotify.com>

plugins/cloudbuild/package.json

@@ -38,7 +38,7 @@
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "4.0.0-alpha.45",
-    "moment": "^2.27.0",
+    "luxon": "^2.0.2",
     "qs": "^6.9.4",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",