Site mapper's deployment Github actions workflows use deprecated and outdated actions

[simon-20]

Brief Description
Site mapper's deployment Github actions workflows use deprecated and outdated actions: some of these run on Node 16, and some on Node 12 (forced to run on 16).

Some of the uses of these actions use deprecated options or switches.

See the full list of warnings here:

https://github.com/IATI/sitemapper/actions/runs/8615133655

Severity
Medium