feat: update my username endpoint (#50271)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

api/package.json

@@ -13,6 +13,7 @@
     "@immobiliarelabs/fastify-sentry": "^6.0.0",
     "@prisma/client": "4.14.1",
     "connect-mongo": "4.6.0",
+    "bad-words": "3.0.4",
     "fastify": "4.17.0",
     "fastify-auth0-verify": "^1.0.0",
     "fastify-plugin": "^4.3.0",
@@ -23,6 +24,7 @@
     "@fastify/type-provider-typebox": "3.2.0",
     "@types/express-session": "1.17.7",
     "@types/supertest": "2.0.12",
+    "@types/bad-words": "^3.0.1",
     "ajv": "8.12.0",
     "dotenv-cli": "7.2.1",
     "jest": "29.5.0",