Release v1.66.1 (#4380)

Co-authored-by: emcfarlane <emcfarlane@users.noreply.github.com>

Author: buf-release-bot[bot]

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## [Unreleased]
+## [v1.66.1] - 2026-03-09
 
 - Fix `exclude_types` in `buf generate` dropping transitive dependencies of import files retained for their extension fields.
 
@@ -1496,7 +1496,7 @@ buf check breaking proto --against .git#branch=master,subdir=proto
 
 Initial beta release.
 
-[Unreleased]: https://github.com/bufbuild/buf/compare/v1.66.0...HEAD
+[v1.66.1]: https://github.com/bufbuild/buf/compare/v1.66.0...v1.66.1
 [v1.66.0]: https://github.com/bufbuild/buf/compare/v1.65.0...v1.66.0
 [v1.65.0]: https://github.com/bufbuild/buf/compare/v1.64.0...v1.65.0
 [v1.64.0]: https://github.com/bufbuild/buf/compare/v1.63.0...v1.64.0

private/buf/bufcli/bufcli.go

@@ -15,4 +15,4 @@
 package bufcli
 
 // Version is the CLI version of buf.
-const Version = "1.66.1-dev"
+const Version = "1.66.1"