Update external-renderers.en-us.md (#13165)

Alpine 3.12 (the version used by current master) no longer provides the python-dev package:
https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.12.0#python2_no_longer_provides_python_and_python-devel

As the next steps explicitely use python3 it is not needed anyway.
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Johan Van de Wauw 2020-10-15 20:30:25 +02:00 committed by GitHub
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@ -36,7 +36,7 @@ FROM gitea/gitea:{{< version >}}
COPY custom/app.ini /data/gitea/conf/app.ini COPY custom/app.ini /data/gitea/conf/app.ini
[...] [...]
RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng libffi-dev python-dev py-pip python3-dev py3-pip py3-pyzmq RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng libffi-dev py-pip python3-dev py3-pip py3-pyzmq
# install any other package you need for your external renderers # install any other package you need for your external renderers
RUN pip3 install --upgrade pip RUN pip3 install --upgrade pip