Release 5.5.0 of the action (#1262)

Release 5.5.0, including the external contribution from
#1252.

CHANGELOG.md

@@ -2,11 +2,13 @@
 
 ## HEAD (Unreleased)
 
-- feat: Trim PR comments from the front
-  ([#1252](https://github.com/pulumi/actions/pull/1252))
-
 ---
 
+## 5.5.0 (2024-08-22)
+
+- feat: Allow trimming PR comments from the front, so the summary is always
+  included in the comment ([#1252](https://github.com/pulumi/actions/pull/1252))
+
 ## 5.4.0 (2024-07-24)
 
 - feat: strip ansi control characters from pull request comment
@@ -312,4 +314,4 @@
 
 ## 2.0.1 (2021-02-26)
 
-- Initial reworking of the Action to be TypeScript based
+- Initial reworking of the Action to be TypeScript based