github: switch to node 20

[kenhys]

Which issue(s) this PR fixes:

N/A

What this PR does / why we need it:

node 16 actions were deprecated. It fixes the following warning:

  Node.js 16 actions are deprecated. Please update the following actions
  to use Node.js 20: microsoft/setup-msbuild@v1.3, actions/cache@v3. For
  more information see:
  https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

How to verify the fixed issue:

Check https://github.com/ThinBridge/Chronos/actions

Expected result:

No warning about GitHub actions (node 16).

[HashidaTKS]

LGTM