update changelog (#930)

Author: gammazero

CHANGELOG.md

@@ -27,6 +27,8 @@ The following emojis are used to highlight certain changes:
 
 - upgrade to `go-libp2p-kad-dht` [v0.33.1](https://github.com/libp2p/go-libp2p-kad-dht/releases/tag/v0.33.1)
 - deprecated `WithPeerLedger` option for bitswap server. Will remove option in next release. See [issue #928](https://github.com/ipfs/boxo/issues/928)
+- gateway: update backend car traversal to use go-car/v2 [#925](https://github.com/ipfs/boxo/issues/925)
+  - This change may prohibit fetching DAGs from CAR files that have no roots.
 
 ### Removed