ci: fix checkout action parameter

[wagner-intevation]

fixes #1226 (comment)

[wagner-intevation]

The suggestion in #1247 (comment) is unnecessarily complex. AFAIK, actions/checkout with default parameters works fine.

[sei-vsarvepalli]

This still fails - see #1250 where there is the fix, we ignore generatedAt irrespective of which file has it. Whenever we touch these workflow files, we also want to update them to pin to SHA256sum in the action: attribute in yaml.

[wagner-intevation]

This still fails - see #1250

If you mean this run: https://github.com/CERTCC/SSVC/actions/runs/35239830122/job/105265173370#step:6:21
The checkout succeeded, but it failed at the unrelated step Fail if fork PR has uncommitted data/ changes.

I then did what the command output told me to do - run make regenerate_json, which deletes lots of data. Looks strange to me, but idk.

[sei-vsarvepalli]

yeh that failure is due to the generatedAt that you mentioned in the earlier comment. That was helpful in me fine tuning it. I can close on this one for now, as duplicate. @bernhardreiter has a few more assigned to him for help.

Duplicate to #1249 - resolving 1233