Remove packages that are provided by Heroku stacks (#19836)

Aptfile

 ffmpeg
-libicu[0-9][0-9]
-libicu-dev
-libidn12
-libidn-dev
 libpq-dev
 libxdamage1
 libxfixes3
-zlib1g-dev
-libcairo2
-libcroco3
-libdatrie1
-libgdk-pixbuf2.0-0
-libgraphite2-3
-libharfbuzz0b
-libpango-1.0-0
-libpangocairo-1.0-0
-libpangoft2-1.0-0
-libpixman-1-0
-librsvg2-2
-libthai-data
-libthai0
-libvpx[5-9]
-libxcb-render0
-libxcb-shm0
-libxrender1