Support Python 3.13

[tunetheweb]

Noticed a couple of issues when using Python 3.13:

• pandas 2.2.2 is not compatible
• datetime.datetime.utcnow is deprecated and down to be removed.

Both fixes are backwards compatible to Python 3.11 (and we demand 3.12 as minimum anyway).

[max-ostapenko]

In workflows we are using runs-on: ubuntu-20.04 which has Python 3.8.10.
E.g. predeploy.yml

Let's change it to 'ubuntu-latest?

[tunetheweb]

Happy to do that, but it overrides it further down to use python 3.12 anyway so doesn't use the default 3.8 anyway.

[max-ostapenko]

Oh, right.
So we can get the environment ready just in 1 step instead of 3
:)

[tunetheweb]

Oh, right. So we can get the environment ready just in 1 step instead of 3 :)

True. But lets leave them separate for now as gives us greater control.