Deploy swh-scheduler v1.9.1

Changes since v1.9.0:

commit 006d60c1c6152f41a2be9f57a125fc9af32fae18 (HEAD -> master, tag: v1.9.1, origin/master, origin/HEAD)
Author: Antoine Lambert <antoine.lambert@inria.fr>
Date:   Tue Jun 13 11:07:58 2023 +0000

    sql: Fix task creation when providing a custom next_run value

    Previously, it was not possible to create sequentially two oneshot tasks
    whose only differ by their next_run value.

    Related to swh/devel/swh-web#4548

commit 04a22075478142552382630e6956c8f179495e75
Author: vlorentz <vlorentz@softwareheritage.org>
Date:   Wed Jun 7 14:43:47 2023 +0000

    cli: Use ctx.fail instead of raising an exception

That version is required to deploy next version of swh-web adding cooldown for webhook requests (swh/devel/swh-web!1141 (merged)).

staging:

• scheduler0: Update package
• scheduler-db: Apply migration script (34)
• systemctl restart gunicorn-swh-scheduler.service
• w/ anlambert: Checks (deployed the new swh-web and trigger check from a webhook)

production:

• Deactivate puppet (so the previous packaging of swh-web is not installed automatically)
• scheduler0: Update package
• Drop old function whose signature got changed after a rename (a while back)
• scheduler-db: Apply migration script (34)
• systemctl restart gunicorn-swh-scheduler.service
• Reactivate puppet
• Checks