Update pgmq.control reference in CONTRIBUTING.md (#327)

Signed-off-by: Emmanuel Ferdman <[email protected]>

CONTRIBUTING.md

@@ -101,7 +101,7 @@ make installcheck
 
 PGMQ Postgres Extension releases are automated through two Github workflows; [Containers / Trunk packages](https://github.com/tembo-io/pgmq/blob/main/.github/workflows/extension_ci.ym), and [PGXN distribution](https://github.com/tembo-io/pgmq/blob/main/.github/workflows/pgxn-release.yml). To create a release:
 
-1. Update and commit the new valid [semver](https://semver.org/) version in [pgmq.control](https://github.com/tembo-io/pgmq/blob/main/pgmq.control).
+1. Update and commit the new valid [semver](https://semver.org/) version in [pgmq.control](https://github.com/tembo-io/pgmq/blob/main/pgmq-extension/pgmq.control).
 2. Create a [Github release](https://github.com/tembo-io/pgmq/releases) using the extension's version for the `tag` and `title`. Auto-generate the release notes and/or add more relevant details as needed.
 
 ### Container Images