Include version comments in GH action uses-lines

[jku]

Dependabot nowadays updates GH action version number if one is included as a comment. That would be useful.

So in all actions in .github/workflows/*.yml instead of using

uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f

we should use:

uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4

Fixing all uses lines does not have to happen in a single PR

[optrudra]

I would like to work on this issue can you assign this to me.

[sumanth8495]

I would like to work on this issue.

[sumanth8495]

I created a PR for this issue.
@optrudra : Hope you don't mind. Didn't notice you were assigned.