build(deps): bump golang from 1.20.7 to 1.21.3 in /sidecar #1111

Job	Run time
Build tailing sidecar operator	2m 43s
Build tailing sidecar operator	2m 43s
Test Helm chart	8m 29s
Test Helm chart	9m 31s
markdownlint	34s
markdownlint	34s
Test Helm chart with cert-manager	8m 47s
Test Helm chart with cert-manager	8m 47s
Test Helm chart with custom configuration	9m 12s
Test Helm chart with custom configuration	8m 48s
Test resources created without Helm chart	9m 8s
Test resources created without Helm chart	9m 22s
yamllint	9s
yamllint	9s
	1h 18m 56s

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