build(deps): bump golang from 1.20.7 to 1.21.4 in /sidecar #1143

Job	Run time
Test resources created without Helm chart	9m 29s
Test resources created without Helm chart	8m 23s
Build tailing sidecar operator	1m 33s
Build tailing sidecar operator	1m 33s
markdownlint	43s
markdownlint	43s
Test Helm chart	9m 22s
Test Helm chart	7m 41s
Test Helm chart with cert-manager	9m 32s
Test Helm chart with cert-manager	9m 57s
Test Helm chart with custom configuration	7m 54s
Test Helm chart with custom configuration	7m 38s
yamllint	4s
yamllint	4s
	1h 14m 36s

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