fix Dockerfile

[deer-wmde]

I'm not sure why these package versions were pinned, but they are not available anymore, which means the docker image does not build:

3.413 E: Version '0.21-12' for 'libasprintf0v5' was not found
3.413 E: Version '1.6-2.1' for 'jq' was not found
3.413 E: Version '72.1-3' for 'libicu-dev' was not found
3.413 E: Version '72.1-3' for 'icu-devtools' was not found

edit: ah the linting demands it

Error: Dockerfile:12 DL3008 warning: Pin versions in apt get install. Instead of `apt-get install <package>` use `apt-get install <package>=<version>`

[tarrow]

I'm not sure why these package versions were pinned, but they are not available anymore, which means the docker image does not build:

it's a classic damned if you do, damned if you don't thing :P

• don't pin them: discover that the build breaks from one day to the next and you have no idea why; turns out to be an unpinned dependency that became incompatible
• pin them: discover that the build breaks because an old dependency is now missing

probably the real right solution is to pin dependencies but also:

• reference them from a source we also maintain and don't randomly remove stuff from until we don't need it
• regularly update the pins after testing (automatically)