Include badly formatted date in error message

Packages/Pachyderm/Sources/Pachyderm/Client.swift

@@ -42,7 +42,7 @@ public struct Client: Sendable {
             } else if let date = iso8601.date(from: str) {
                 return date
             } else {
-                throw DecodingError.typeMismatch(Date.self, .init(codingPath: container.codingPath, debugDescription: "unexpected date format"))
+                throw DecodingError.typeMismatch(Date.self, .init(codingPath: container.codingPath, debugDescription: "unexpected date format: \(str)"))
             }
         })