Bump exiftool version to 12.42

What does this MR do?

Bump exiftool version to more recent 12.42

Related issues

Closes gitlab-org/charts/gitlab#3453

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
  • N/A
• Documentation created/updated
  • N/A
• Integration tests added to GitLab QA
  • N/A
• The impact any change in container size has should be evaluated
  • N/A