Update release recommendations

Author: cschwan

CONTRIBUTING.md

@@ -71,12 +71,15 @@ increasing the MSRV make sure to set it everywhere to the same value:
 ## Making a new release
 
 First make sure the release workflow works; since we've hard-coded runner image
-and action versions, it's possible that the workflow must be updated. To check
-whether that's the case, go to
-<https://github.com/NNPDF/pineappl/actions/workflows/release.yml> and click the
-'Run workflow' button, then click the 'Run workflow' button. This will not
-upload anything. Wait for the 'Release' action to finish, and fix problems in a
-separate branch.
+and action versions, it's possible that the workflow must be updated if these
+images don't exist anymore. To check whether that's the case, manually trigger
+the following workflows:
+
+- <https://github.com/NNPDF/pineappl/actions/workflows/release-wheels.yaml>
+- <https://github.com/NNPDF/pineappl/actions/workflows/release-cli-wheels.yaml>
+
+This will not upload anything. Wait for the actions to finish, and fix problems
+in a separate branch.
 
 Next, go to the `maintainers` directory, run