chore: bump bundle size restriction temporarily

This will come down again when we switch to the new version of Peer ID with async/await (since it will use the same `multihashing-async` as the included IPLD formats):

```js
ipfs-http-client@33.0.1 /Users/alan/Code/protocol-labs/js-ipfs-http-client
├─┬ ipld-dag-cbor@0.15.0
│ └── multihashing-async@0.7.0 
├─┬ ipld-dag-pb@0.17.4
│ └── multihashing-async@0.7.0  deduped
└─┬ peer-id@0.12.2
  └─┬ libp2p-crypto@0.16.1
    ├─┬ libp2p-crypto-secp256k1@0.3.1
    │ └── multihashing-async@0.6.0 
    └── multihashing-async@0.5.2 
```

.aegir.js

@@ -5,7 +5,7 @@ const createServer = require('ipfsd-ctl').createServer
 const server = createServer()
 
 module.exports = {
-  bundlesize: { maxSize: '236kB' },
+  bundlesize: { maxSize: '237kB' },
   webpack: {
     resolve: {
       mainFields: ['browser', 'main']