chore(main): release 1.9.0 (#47)

🤖 I have created a release *beep* *boop*
---


##
[1.9.0](v1.8.0...v1.9.0)
(2025-04-21)


### Features

* Include response headers in subscription errors
([#46](#46))
([271f33d](271f33d))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.8.0"
+  ".": "1.9.0"
 }

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to the project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [1.9.0](https://github.com/launchdarkly/eventsource/compare/v1.8.0...v1.9.0) (2025-04-21)
+
+
+### Features
+
+* Include response headers in subscription errors ([#46](https://github.com/launchdarkly/eventsource/issues/46)) ([271f33d](https://github.com/launchdarkly/eventsource/commit/271f33d1c064eb030c62d1a050ca2b6b476fd202))
+
 ## [1.8.0](https://github.com/launchdarkly/eventsource/compare/v1.7.1...v1.8.0) (2024-12-19)