Update reference.md to fix broken link

[toniprice]

Remove extra trailing 'c' in link https://gitlab.com/pymarc/pymarcc

[github-actions]

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🤖 This automated message can help you check the rendered files in your submission for clarity. If you have any questions, please feel free to open an issue in {sandpaper}.

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-git/compare/md-outputs..md-outputs-PR-185

The following changes were observed in the rendered markdown documents:

 md5sum.txt   | 2 +-
 reference.md | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2025-08-06 09:49:13 +0000

[alex-ball]

@toniprice , thanks so much for fixing this broken link. Much appreciated!