Bump Foundry Test actions/checkout Version to V4

[soloseng]

Description

Updated the foundry test yaml following warnings about node12 being deprecated and actions/checkout@v2 uses node12.

Warning message:

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

[changeset-bot]

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Latest commit: 1a600a5

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