Update dependency s3transfer to v0.6.0

This MR contains the following updates:

Package	Type	Update	Change
s3transfer	ironbank-pypi	minor	0.5.2 -> 0.6.0

---

Release Notes

boto/s3transfer

v0.6.0

Compare Source

=====

• feature:Python: Dropped support for Python 3.6

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.