Prepare release v1.21.0

Author: hsanjuan

CHANGELOG.md

@@ -19,13 +19,25 @@ The following emojis are used to highlight certain changes:
 
 ### Fixed
 
+### Removed
+
+### Security
+
+## [1.21.0]
+
+### Added
+
+### Changed
+
+### Fixed
+
 - Upgrade go-ds-pebble to [v0.5.6](https://github.com/ipfs/go-ds-pebble/releases/tag/v0.5.6) and pebble to [v2.1.1](https://github.com/cockroachdb/pebble/releases/tag/v2.1.1)
+- Update to boxo [v0.35.1](https://github.com/ipfs/boxo/releases/tag/v0.35.1) with fixes for QUIC, httpnet and block tracing.
 
 ### Removed
 
 ### Security
 
-
 ## v1.20.0
 
 ### Added

version.json

@@ -1,3 +1,3 @@
 {
-  "version": "v1.20.0"
+  "version": "v1.21.0"
 }