Use recommendedPartSize from b2_authorize_account response for large file uploads

[dkocher]

For issues as described in #14848 we should possibly adjust the part size dynamically. Currently set to 104857600 ¹.

Footnotes

1. https://github.com/iterate-ch/cyberduck/blob/6d4124fbd6838b0c2d186d74c7f0e2f1c0980be2/defaults/src/main/resources/default.properties#L433C1-L434C1 ↩