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b0720ea5 - Improve error message for dependencies with no versions available (#342)

Improve error message for dependencies with no versions available (#342) Partially addresses https://github.com/astral-sh/puffin/issues/310 Addresses case at https://github.com/astral-sh/puffin/issues/309#issuecomment-1793541558 Follow-up to #300 ensuring `PuffinExternal` is used consistently when formatting messages Example at https://github.com/astral-sh/puffin/pull/342/files#diff-5c74a74ef34ef1d6e7453de8d2d19134813156e8b6a657e6b5ed71fda5a3a870