Fix outdated tox minversion
The allowlist_externals option is supported since 3.18.0 . Change-Id: I6efafb1e0baf6a4d921d45c0d4fc6202cedb2df0
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The allowlist_externals option is supported since 3.18.0 . Change-Id: I6efafb1e0baf6a4d921d45c0d4fc6202cedb2df0