chore(main): release 1.7.3 (#302)

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 @@
 {
-  ".": "1.7.2"
+  ".": "1.7.3"
 }

CHANGES.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.7.3](https://github.com/googleapis/go-sql-spanner/compare/v1.7.2...v1.7.3) (2024-10-08)
+
+
+### Bug Fixes
+
+* Avoid session leak on transaction retry ([#300](https://github.com/googleapis/go-sql-spanner/issues/300)) ([#301](https://github.com/googleapis/go-sql-spanner/issues/301)) ([129248c](https://github.com/googleapis/go-sql-spanner/commit/129248c4caa86ba41e2d9b27a9a6c9a0533fd302))
+
 ## [1.7.2](https://github.com/googleapis/go-sql-spanner/compare/v1.7.1...v1.7.2) (2024-09-30)