Typo fix

bilby/core/sampler/dynesty.py

@@ -394,7 +394,7 @@ class Dynesty(NestedSampler):
                 )
                 for code in versions:
                     if not versions[code] == sampler.versions.get(code, None):
-                        logger.warning(version_message.format(
+                        logger.warning(version_warning.format(
                             code=code,
                             old=sampler.versions.get(code, "None"),
                             new=versions[code]