[loadgen/otelbench] Update changelog for v0.5.0 (#727)

* Update otelbench changelog and delete changelog fragments.

* Update loadgen/cmd/otelbench/CHANGELOG.md

---------

Co-authored-by: obltmachine <[email protected]>
Co-authored-by: Carson Ip <[email protected]>

Author: 3 people

loadgen/cmd/otelbench/.chloggen/build_for_multiple_platforms.yaml

@@ -4,6 +4,13 @@
 
 <!-- next version -->
 
+## v0.5.0
+
+### 💡 Enhancements 💡
+
+- `otelbench`: Updating the relevant github_action workflow to build in both amd64/arm64 platforms (#725)
+- `otelbench`: Fix loadgenreceiver panic on record count when struct is mutated (#721)
+
 ## v0.4.0
 
 ### 💡 Enhancements 💡

loadgen/cmd/otelbench/CHANGELOG.md

@@ -1,6 +1,6 @@
 include ../../../Makefile.Common
 
-VERSION := v0.4.0
+VERSION := v0.5.0
 
 .PHONY: get-version
 get-version: