CHANGELOG.md: add release heading for v0.44.0

This is an automated CL which updates the CHANGELOG.md.

Change-Id: If7ffd69cb71a3c420e5f3bd8cc9e6de4c74b183e
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/636456
Auto-Submit: Gopher Robot <gobot@golang.org>
kokoro-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Commit-Queue: Gopher Robot <gobot@golang.org>

Author: gopherbot

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ## Unreleased
 
+## v0.44.0
+
+Date: 2024-12-16
+
 ### Changes
 
 * Gopls v0.17: The latest gopls version as of this release is [gopls v0.17](https://github.com/golang/tools/releases/tag/gopls%2Fv0.17.0). The extension settings documentation has been updated to align with the latest gopls settings.