tox: use pypandoc_binary instead of pypandoc

This installs pandoc from a binary wheel instead of requiring it in the
system (apt install in CI). While system pandoc may be more trustworthy,
we already trust pypandoc so might as well trust the binary wheels
(which from the same project) to make it easier to run.

Author: bluetech

.github/workflows/deploy.yml

@@ -95,7 +95,6 @@ jobs:
       env:
         VERSION: ${{ github.event.inputs.version }}
       run: |
-        sudo apt-get install pandoc
         tox -e generate-gh-release-notes -- "$VERSION" gh-release-notes.md
 
     - name: Upload release notes

tox.ini

@@ -212,5 +212,5 @@ commands = python scripts/prepare-release-pr.py {posargs}
 description = generate release notes that can be published as GitHub Release
 usedevelop = True
 deps =
-    pypandoc
+    pypandoc_binary
 commands = python scripts/generate-gh-release-notes.py {posargs}