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Update CI workflow #1208

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Update CI workflow #1208

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dhil
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@dhil dhil commented Feb 11, 2025

Github is deprecating the CI image ubuntu-20.04:

The Ubuntu 20.04 runner image will be fully unsupported by April 1, 2025. To raise awareness of the upcoming removal, we will temporarily fail jobs using Ubuntu 20.04. Builds that are scheduled to run during the brownout periods will fail. The brownouts are scheduled for the following dates and times:

March 4 14:00 UTC – 22:00 UTC
March 11 13:00 UTC – 21:00 UTC
March 18 13:00 UTC – 21:00 UTC
March 25 13:00 UTC – 21:00 UTC

What you need to do

Jobs using the ubuntu-20.04 YAML workflow label should be updated to ubuntu-22.04, ubuntu-24.04 or ubuntu-latest. You can always get up-to-date information on our tools by reading about the software in the runner images repository. Please contact GitHub Support if you run into any problems or need help.

This patch updates the CI to use the ubuntu-latest image.

In addition, this patch changes the OCaml compiler used for testing to 5.3.0 and upgrades the version of ocaml/setup-ocaml to version 3, which contains several fixes for the OCaml 5.3 toolchain.

Probably #1204 needs to land first.

Github is deprecating the CI image `ubuntu-20.04`:

> The Ubuntu 20.04 runner image will be fully unsupported by April 1, 2025. To raise awareness of the upcoming removal, we will temporarily fail jobs using Ubuntu 20.04. Builds that are scheduled to run during the brownout periods will fail. The brownouts are scheduled for the following dates and times:
>
>    March 4 14:00 UTC – 22:00 UTC
>    March 11 13:00 UTC – 21:00 UTC
>    March 18 13:00 UTC – 21:00 UTC
>    March 25 13:00 UTC – 21:00 UTC
>
> What you need to do
>
> Jobs using the ubuntu-20.04 YAML workflow label should be updated to ubuntu-22.04, ubuntu-24.04 or ubuntu-latest. You can always get up-to-date information on our tools by reading about the software in the runner images repository. Please contact GitHub Support if you run into any problems or need help. 

This patch updates the CI to use the `ubuntu-latest` image. 

In addition, this patch changes the OCaml compiler used for testing to 5.3.0 and upgrades the version of `ocaml/setup-ocaml` to version 3, which contains several fixes for the OCaml 5.3 toolchain.
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