chore: added zizmor to GH Actions ci workflow

[jurerotar]

Another safety-oriented PR. Zizmor is essentially a linter for GH Actions, if we add any funky settings to them in the future, they should be flagged with this.

https://github.com/zizmorcore/zizmor

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[jurerotar]

Ah, it seems we're already doing it, I wasn't aware. I'll close this PR then 😄

[tomayac]

Perfect, still thanks for the double check.