fix(pull-request-checks-workflow): update changeset status reference

This commit updates the changeset status command in the pull request
checks workflow. The reference for the changeset status command has been
 changed from 'main' to 'origin/main'. This makes it more explicit and
 might address potential issues where the checker failed due to
 incorrect branch reference.

Signed-off-by: Giovanni Ravalico <[email protected]>

.github/workflows/pull-request-checks-workflow.yml

@@ -55,4 +55,4 @@ jobs:
             .
 
       - name: 🦋 Require changesets
-        run: pnpm exec changeset status --since=main
+        run: pnpm exec changeset status --since=origin/main