cicd: bump version of github checkout action to v4

optimad / bitpit

Open source library for scientific HPC

http://optimad.github.io/bitpit/

GNU Lesser General Public License v3.0

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Closed andrea-iob closed 4 months ago

andrea-iob commented 5 months ago

This should fix the following warning:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3. For more information see...

andrea-iob commented 4 months ago

Rebased on current master.