Update changelog for 1.2.4

Author: saikat-royc

CHANGELOG/CHANGELOG-1.2.md

@@ -1,3 +1,22 @@
+# v1.2.4 - Changelog since v1.2.3
+
+## Changes by Kind
+
+### Bug or Regression
+
+- Update go builder to 1.17 ([#850](https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/850), [@mattcary](https://github.com/mattcary))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+_Nothing has changed._
+
+### Removed
+_Nothing has changed._
+
 # v1.2.3 - Changelog since v1.2.1
 
 ## Changes by Kind