Update CHANGELOG.md

Author: lalitb

opentelemetry-proto/CHANGELOG.md

@@ -3,7 +3,6 @@
 ## vNext
 
 - Update proto definitions to v1.8.0.
-- Update proto definitions to v1.7.0.
 - Added Rust generated protos for profiles collector. [#3077](https://github.com/open-telemetry/opentelemetry-rust/pull/3077)
 - **Breaking change**: package opentelemetry_proto::tonic::profiles::v1 renamed to opentelemetry_proto::tonic::profiles::v1development. [#3077](https://github.com/open-telemetry/opentelemetry-rust/pull/3077)
 - Update `tonic` dependency version to 0.14.1