[chore] Promote Chao Weng to triager (#12445)

## Description

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->

Promote @sincejune to triager on behalf of
@open-telemetry/collector-maintainers.

PRs reviewed:
https://github.com/open-telemetry/opentelemetry-collector/pulls?q=is%3Apr+reviewed-by%3Asincejune+
PRs authored:
https://github.com/open-telemetry/opentelemetry-collector/pulls?q=is%3Apr+author%3Asincejune+
Issues commented:
https://github.com/open-telemetry/opentelemetry-collector/issues?q=is%3Aissue+commenter%3Asincejune+
Commits:
https://github.com/open-telemetry/opentelemetry-collector/commits?author=sincejune

Author: mx-psi

README.md

@@ -163,6 +163,7 @@ Here is a list of community roles with current and previous members:
 - Triagers ([@open-telemetry/collector-triagers](https://github.com/orgs/open-telemetry/teams/collector-triagers)):
 
   - [Andrzej Stencel](https://github.com/andrzej-stencel), Elastic
+  - [Chao Weng](https://github.com/sincejune), AppDynamics
   - [Damien Mathieu](https://github.com/dmathieu), Elastic
   - [Jade Guiton](https://github.com/jade-guiton-dd), Datadog
   - Actively seeking contributors to triage issues