CHANGELOG.md: add release heading for v0.45.2

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

Change-Id: I2d20123519155a794c5e2d10b9264bebde8d987e
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/650618
kokoro-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>

Author: gopherbot

CHANGELOG.md

@@ -20,6 +20,15 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 * Improved Error Reporting: Code action resolution failures now display error messages via notifications from gopls.
 * Removed unnecessary prompts for missing formatter tools when gopls is enabled ([Issue 3677](https://github.com/golang/vscode-go/issues/3677)).
 
+## v0.45.2 (prerelease)
+
+Date: 2025-02-19
+
+This is the [pre-release version](https://code.visualstudio.com/api/working-with-extensions/publishing-extension#prerelease-extensions) of v0.46.
+
+**Full Changelog**: https://github.com/golang/vscode-go/compare/v0.44.0-rc.1...v0.45.2
+**Milestone**: https://github.com/golang/vscode-go/issues?q=milestone%3Av0.46.0
+
 ## v0.45.1 (prerelease)
 
 Date: 2025-02-11