Update CHANGELOG.md from release 26.3.0 (#764) #273

Job	Run time
Detect relevant changed files	6s
Run cargo-udeps	2m 3s
Build/Publish amd64 Image	6m 53s
Build/Publish arm64 Image	5m 51s
Package/Publish 0.0.0-dev Helm Chart	37s
Publish/Sign 0.0.0-dev Index	28s
Run OpenShift Preflight Check for 0.0.0-dev-arm64	16s
Run OpenShift Preflight Check for 0.0.0-dev-amd64	16s
Failure Notification	0s
Finished Build and Publish	2s
	16m 32s

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