lambda not working after redeploy

[iain-b]

I ran yarn yarn run deploy:lambda updating to node 16 (as it happened this could be done in the UI).

subsequently the lambda fails with

2022-08-16T09:08:01.685Z	undefined	ERROR	Uncaught Exception 	
{
    "errorType": "Runtime.ImportModuleError",
    "errorMessage": "Error: Cannot find module '@bugsnag/js'\nRequire stack:\n- /var/task/dist/app.js\n- /var/task/dist/lambda.js\n- /var/runtime/index.mjs",
    "stack": [
        "Runtime.ImportModuleError: Error: Cannot find module '@bugsnag/js'",
        "Require stack:",
        "- /var/task/dist/app.js",
        "- /var/task/dist/lambda.js",
        "- /var/runtime/index.mjs",
        "    at _loadUserApp (file:///var/runtime/index.mjs:726:17)",
        "    at async Object.module.exports.load (file:///var/runtime/index.mjs:741:21)",
        "    at async file:///var/runtime/index.mjs:781:15",
        "    at async file:///var/runtime/index.mjs:4:1"
    ]
}

I'm not sure if this is an issue with @bugsnag or what we expect the state of this app to be so I'm not going to debug at this time but just leave this context here.