Merge pull request #407 from SiaFoundation/release

chore: prepare release 0.21.2

Author: ChrisSchinnerl

.changeset/always_cancel_read_side_of_stream_when_calling_streamclose.md

@@ -1,3 +1,19 @@
+## 0.21.2 (2026-04-10)
+
+### Features
+
+- RHP4 graceful shutdown
+
+### Fixes
+
+- Always cancel read side of QUIC stream when calling stream.Close.
+- Fixed an edge case in `RPCFreeSectors` where the deletion logic would keep a sector root that was supposed to be deleted.
+- Pass proper descriptions when closing QUIC connection.
+- Fixed excessive "peer relayed a v2 header with unknown parent" log spam by only relaying headers after sync when the synced blocks became the new tip.
+- Update Go version to 1.26.0.
+- Update mux dependency to v1.5.0.
+- Use DEBUG log level instead of ERROR for RPCs failing due to the peer closing the connection on their end.
+
 ## 0.21.1 (2026-02-25)
 
 ### Fixes

.changeset/fix_an_edge_case_in_rpcfreesectors_where_the_swap_and_truncate_deletion_logic_could_preserve_a_sector_root_that_was_supposed_to_be_deleted.md

@@ -1,4 +1,4 @@
-module go.sia.tech/coreutils // v0.21.1
+module go.sia.tech/coreutils // v0.21.2
 
 go 1.26.0