Fix daily pandoc check action on Ubuntu

[cderv]

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https://github.com/rstudio/rmarkdown/runs/7743229397?check_suite_focus=true

It seems the daily pandoc binary is built on unbuntu 20 now and that cause issue on 18 where GLIBC 2.9 is not available. Or something like that.

I need to look into that.

[yihui]

It seems the change should be simple enough like this? https://github.com/yihui/travis-bin/commit/1508c6fcffa4d3c84861cb489393fbd8afbd4a8a I wonder why we are using windows-latest and macos-latest but a fixed version of ubuntu.

[cderv]

Yes you are right. We should do that. I think we use 18 because I kept the version when migrated from Travis but using the latest should be fine.

However, I think it is interested to check that pandoc will still be working on Ubuntu 18. I open this issue to remember to check in pandoc project why the change.

You can make the change for this project to use latest though. Thanks!

[yihui]

Okay, I'll leave this issue to you then.

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