Updated Release Notes for 1.300066.0 (#2068)

Author: mitali-salvi

RELEASE_NOTES

@@ -1,3 +1,14 @@
+========================================================================
+Amazon CloudWatch Agent 1.300066.0 (2026-03-25)
+========================================================================
+Features:
+* [OTLP] Support for configuring otlphttp exporter to publish to AWS OTLP endpoint using YAML
+* [ContainerInsights] Add support for publication to AWS OTLP endpoint using YAML
+
+Enhancements:
+* [Agent] Bump Go 1.25.8 and grpc v1.79.3 with dependency updates
+* [Agent] Remove ec2tagger from system-metrics pipeline if IMDS is not accessible
+
 ========================================================================
 Amazon CloudWatch Agent 1.300065.0 (2026-03-17)
 ========================================================================