fix: increase total limit in multipart example

[MMitsuha]

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PR Type

Bug Fix

PR Checklist

• [x] Tests for the changes have been added / updated.
• [x] Documentation comments have been added / updated.
• [ ] A changelog entry has been made for the appropriate packages.
• [x] Format code with the latest stable rustfmt.
• [x] (Team) Label with affected crates and semver status.

Overview

Now example in multipart has a new total limit of 100 MiB, which fix the error when uploading file bigger than 50 MiB (default)

Closes #3549