Pin versions of sandpaper, pegboard, and varnish

[astroDimitrios]

Pinning these dependencies to my versions of these packages so we can user Mermaid, sphinx like tabs, and the Dark mode.
I think this will work! It does locally but I guess the real test is whether the GitHub pages deployment is happy with the pinned versions.

Links to the separate pull requests for more info:

• tab & group-tab panels
  Add support for tabs / tabset panels carpentries/sandpaper#571
  Add support for tabs / tabset panels carpentries/pegboard#148
  Add support for tabs / tabset panels carpentries/varnish#121
• Dark theme / mode
  Implement dark mode carpentries/varnish#124
• Add Mermaid diagram support
  Incorporate mermaid diagrams carpentries/varnish#125

[github-actions]

Thank you!

Thank you for your pull request 😃

🤖 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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🔍 Inspect the changes: https://github.com/carpentries-incubator/intro-to-modern-fortran/compare/md-outputs..md-outputs-PR-7

The following changes were observed in the rendered markdown documents:

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 2 files changed, 4 insertions(+), 1 deletion(-)

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⏱️ Updated at 2024-02-20 21:16:44 +0000

[jfrost-mo]

I've chased the documentation and code through several repositories, and still haven't found what uses these keys, but it looks similar to what some other carpentries repositories do, and is thus probably fine.

You'll want to be careful about testing before pushing to main in these forks, as they will be directly used here.