Downgrade prawn 2.4.0 due to Embedded Font problem in Chrome (windows only) and Acrobat

[Eric-Guo]

Upstream issue

Below is the problem PDF file:

[ulferts]

@Eric-Guo thanks for the PR.

@as-op can you please look into this?

[Eric-Guo]

I can confirm Acrobat Pro DC 2023.001 ~ Acrobat Pro DC 2024.002 all having missing fonts issue. some smart PDF reader, like PDF Expert / FoxReader will resolve missing fonts problem automatically. So not every PDF reader having problem.

[as-op]

Thank you @Eric-Guo for bringing this to our attention!

I tried with Acrobat Reader 2024.002.20287, but that is not affected. As there is a reproducible case in the linked upstream issue and the confirmation by @Eric-Guo we should downgrade.

Our dependency md-to-pdf is still on prawn 2.4.0 anyhow, so the downgrade should be safe.
I verified this PR, it successfully downgrades to unaffected gem versions.

% bundle exec gem list --all --exact prawn ttfunk pdf-core

*** LOCAL GEMS ***

prawn (2.4.0)

*** LOCAL GEMS ***

ttfunk (1.7.0)

*** LOCAL GEMS ***

pdf-core (0.9.0)