ci: enhance changelog update step with previous tag reference

- Added step to retrieve the previous tag for more accurate changelog generation.

Author: QuadStingray

.github/workflows/main_test_release.yml

@@ -85,8 +85,7 @@ jobs:
         uses: requarks/changelog-action@main
         with:
           token: ${{ github.token }}
-          toTag: ${{ env.previousTag }}
-          fromTag: ${{ env.fromTag }}
+          tag: ${{ env.previousTag }}
 
       - name: Commit CHANGELOG.md
         uses: stefanzweifel/git-auto-commit-action@master