Deprecation warning on save action in check-amalgamation CI step

[nlohmann]

Description

The save step of check-amalgamation.yml shows a deprecation warning.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Reproduction steps

Run CI.

Expected vs. actual results

Expected: no message

Actual: deprecation message

Minimal code example

No response

Error messages

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Compiler and operating system

CI

Library version

3.11.3

Validation

• [X] The bug also occurs if the latest version from the develop branch is used.
• [X] I can successfully compile and run the unit tests.

[gregmarr]

v3 uses Node 16, should be otherwise compatible.