chore(main): release 1.21.0 (#587)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.20.0"
+  ".": "1.21.0"
 }

CHANGES.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [1.21.0](https://github.com/googleapis/go-sql-spanner/compare/v1.20.0...v1.21.0) (2025-10-29)
+
+
+### Features
+
+* Support connect_timeout property ([#577](https://github.com/googleapis/go-sql-spanner/issues/577)) ([6f87624](https://github.com/googleapis/go-sql-spanner/commit/6f87624c06e79401e3916d485b3d74ecc0c6bc05)), refs [#576](https://github.com/googleapis/go-sql-spanner/issues/576)
+
+
+### Bug Fixes
+
+* Remove git submodule from project ([#586](https://github.com/googleapis/go-sql-spanner/issues/586)) ([bb26650](https://github.com/googleapis/go-sql-spanner/commit/bb26650539dda6e744f7db13eb197b55fec1a2da))
+* Update all dependencies ([#584](https://github.com/googleapis/go-sql-spanner/issues/584)) ([19ce82c](https://github.com/googleapis/go-sql-spanner/commit/19ce82c583fccf425d0dff5b3202b82a7d81d8f1))
+
 ## [1.20.0](https://github.com/googleapis/go-sql-spanner/compare/v1.19.0...v1.20.0) (2025-10-28)
 
 

driver.go

@@ -51,7 +51,7 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
-const userAgent = "go-sql-spanner/1.20.0" // x-release-please-version
+const userAgent = "go-sql-spanner/1.21.0" // x-release-please-version
 
 const gormModule = "github.com/googleapis/go-gorm-spanner"
 const gormUserAgent = "go-gorm-spanner"