build(deps): bump golang from 1.20.7 to 1.21.3 in /sidecar #1120

Job	Run time
Build tailing sidecar operator	2m 38s
Build tailing sidecar operator	2m 38s
Test Helm chart with cert-manager	8m 49s
Test Helm chart with cert-manager	8m 37s
markdownlint	39s
markdownlint	39s
Test Helm chart	8m 24s
Test Helm chart	8m 25s
Test Helm chart with custom configuration	9m 2s
Test Helm chart with custom configuration	8m 17s
Test resources created without Helm chart	9m 25s
Test resources created without Helm chart	9m 17s
yamllint	6s
yamllint	6s
	1h 17m 2s

Provide feedback