Update outdated/deprecated actions

[paulo-ferraz-oliveira]

Description

• moves all actions/checkout to @v4
• moves all erlef/setup-beam to @v1
• moves all actions/setup-node to @v4

(this also includes what we suggest in README)

Closes #243.

• I have performed a self-review of my changes
• I have read and understood the contributing guidelines

[paulo-ferraz-oliveira]

This seems to still complain about our own action but I can't see where. I'd merge this and then check the results in main, before releasing. I don't know where GHA is getting the NodeJS is prior to 20 warning from...