[BUG] Do not use backticks in shell files

[vil02]

Is there an existing issue for this?

• I have searched the existing issues.

Current Behavior

gh_retry.sh uses depreciated backticks (cf. SC2006).

Expected Behavior

Not relevant.

Steps To Reproduce

One can run shellcheck on mentioned script.

Relevant log output

Not relevant.

Environment

Not relevant.

Anything else?

Feel free to assign me to this issue.

Usually I would submit a PR directly, but the contribution guidelines asked to create an issue first.

[monu-y]

can someone assign this to me. I would like to take this forward.

[vil02]

@monu-y: please have a look at the Anything else? section of my post.