Adapt Pandoc action to new macOS installer

[IndrajeetPatil]

Closes #715

[codecov-commenter]

Codecov Report

Merging #716 (345fbd3) into v2-branch (4376fa2) will not change coverage.
The diff coverage is n/a.

❗ Current head 345fbd3 differs from pull request most recent head 687df83. Consider uploading reports for the commit 687df83 to get more accurate results

@@             Coverage Diff             @@
##           v2-branch      #716   +/-   ##
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  Coverage     100.00%   100.00%           
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  Files              2         2           
  Lines             10        10           
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  Hits              10        10           

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[gaborcsardi]

Thanks!

[github-actions]

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