update release_checklist.rst

release_checklist.rst

@@ -7,4 +7,5 @@
 * Update the compatibility in the docs: intro.rst / Compatibility
 * Update the version of THIS package in the pyproject.toml file
 * Revert to released version of dpf core in the pyproject.toml file
+* Update lock file: poetry lock
 * Follow this guide (https://dev.docs.pyansys.com/how-to/releasing.html) to create a release branch and release. Also bump version in test_metadata.py test.