updating changelog

.chloggen/refactoring-removing-not-needed-environmental-variables.yaml

@@ -6,7 +6,7 @@ component: clusterReceiver
 note: clusterReceiver refactor by removing unnecessary environmental variables after introducing the k8sAttributesProcessor to clusterReceiver, and improve the configuration for the metrics k8sAttributesProcessor
 
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-issues: []
+issues: [1540]
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