Prepare release v9.1.1

Created-by: polyglot-release v1.3.2

Author: luke-hill

CHANGELOG.md

@@ -9,6 +9,8 @@ This document is formatted according to the principles of [Keep A CHANGELOG](htt
 Please visit [cucumber/CONTRIBUTING.md](https://github.com/cucumber/cucumber/blob/master/CONTRIBUTING.md) for more info on how to contribute to Cucumber.
 
 ## [Unreleased]
+
+## [9.1.1] - 2024-01-04
 ### Added
 
 ### Changed
@@ -136,7 +138,8 @@ can use the immutable versions instead: `DataTable#map_column` and
 ([#1590](https://github.com/cucumber/cucumber-ruby/pull/1590))
 - Removed support for Ruby 2.5 and JRuby 9.2.
 
-[Unreleased]: https://github.com/cucumber/cucumber-ruby/compare/v9.1.0...HEAD
+[Unreleased]: https://github.com/cucumber/cucumber-ruby/compare/v9.1.1...HEAD
+[9.1.1]: https://github.com/cucumber/cucumber-ruby/compare/v9.1.0...v9.1.1
 [9.1.0]: https://github.com/cucumber/cucumber-ruby/compare/v9.0.2...v9.1.0
 [9.0.2]: https://github.com/cucumber/cucumber-ruby/compare/v9.0.1...v9.0.2
 [9.0.1]: https://github.com/cucumber/cucumber-ruby/compare/v9.0.0...v9.0.1

VERSION

@@ -1 +1 @@
-9.1.0
+9.1.1