CHANGELOG.md: update PR number for changelog entry

Author: krantideep95

CHANGELOG.md

@@ -26,7 +26,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Fixed
 
-- Possible nil dereference panic in `go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace`. (#5187)
+- Possible nil dereference panic in `go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace`. (#5965)
 
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