Add changelog entry for v3.28.20 backport #5122

Job	Run time
Go: tracing with legacy workflow (macos-latest, stable-v2.16.6)	4m 29s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.16.6)	1m 38s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 46s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	3m 36s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	3m 53s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 47s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	3m 22s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 38s
Go: tracing with legacy workflow (macos-latest, default)	5m 20s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 21s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 1s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 28s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 26s
Go: tracing with legacy workflow (macos-latest, linked)	4m 14s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	3m 17s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	3m 16s
	43m 32s

Provide feedback