Serverless Stack

I think there may be some incompatibility with Node 16.  I had some low level error with the runtime that is spawned when a lambda is invoked and downgrading to Node 15 fixed. I'll try to recreate to get the exact error

```(node:102808) [DEP0111] DeprecationWarning: Access to process.binding('http_parser') is deprecated.
(Use `node --trace-deprecation ...` to show where the warning was created)
/usr/bin/node[102808]: ../src/node_http_parser.cc:567:static void node::{anonymous}::Parser::Initialize(const v8::FunctionCallbackInfo&lt;v8::Value&gt;&amp;): Assertion `args[3]-&gt;IsInt32()' failed.
 1: 0x55b60d57d301 node::Abort() [/usr/bin/node]
 2: 0x55b60d57d397  [/usr/bin/node]
 3: 0x55b60d598ab5  [/usr/bin/node]
 4: 0x55b60d7bf017 v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo) [/usr/bin/node]
 5: 0x55b60d7bff1c  [/usr/bin/node]
 6: 0x55b60d7c04cf  [/usr/bin/node]
 7: 0x55b60d7c07e6 v8::internal::Builtin_HandleApiCall(int, unsigned long*, v8::internal::Isolate*) [/usr/bin/node]
 8: 0x55b60e039a59  [/usr/bin/node]```

This might actually have nothing to do with sst