Remove trailing commas in example JSON metadata

[martinherrerias]

json.load doesn't like the trailing commas on the last two list elements of the example JSON metadata

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/UoMResearchIT/programming_with_python/compare/md-outputs..md-outputs-PR-43

The following changes were observed in the rendered markdown documents:

 02-dictionaries.md | 4 ++--
 md5sum.txt         | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

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⏱️ Updated at 2025-05-14 09:56:59 +0000

[andrewgait]

I'm not completely sure this is true in more recent versions, but it looks neater without the comma so this is fine to be merged.