build(deps): bump golang from 1.21.5 to 1.21.6 in /operator #1198

Job	Run time
Build tailing sidecar operator	1m 34s
markdownlint	24s
Test Helm chart (fluentbit)	3m 35s
Build otelcol sidecar	3m 3s
Test Helm chart (otelcol)	6m 27s
Test Helm chart with cert-manager (fluentbit)	3m 59s
Test Helm chart with custom configuration (fluentbit)	4m 37s
Test Helm chart with cert-manager (otelcol)	5m 49s
Test resources created without Helm chart (fluentbit)	4m 45s
Test Helm chart with custom configuration (otelcol)	6m 31s
yamllint	5s
Test resources created without Helm chart (otelcol)	6m 3s
	46m 52s

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