0.8.3 build and changelog

Author: singerb

docs/changelogs/0.8.3.md

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+### QIT CLI 0.8.3 Release Notes
+
+#### What’s New
+
+Extension set support in local activation tests.
+
+#### Support and Feedback
+
+If you have any questions, encounter issues, or have suggestions, please visit our [GitHub Issues Page](https://github.com/woocommerce/qit-cli/issues). Your feedback helps us continually improve QIT.