Fix warnings on GH actions, doctests

[vfdev-5]

We need to fix the following warnings

build-deploy
Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: actions/checkout@v2, actions/cache@v2. For more information see: https://github.blog/changelog/2022-0


build-deploy
The `save-state` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

reported here:

• https://github.com/pytorch/ignite/actions/runs/4168889860

[DeepC004]

I would like to contribute to the issue.

[vfdev-5]

@DeepC004 go ahead !