WIP: update to flutter version to stable 1.20.4

Closed Leon Botros requested to merge flutter1.20 into master

The MR https://gitlab.science.ru.nl/irma/irmamobile/-/merge_requests/422 prepares irmamobile for flutter 1.20.4. This also requires building the app on the CI with a newer flutter version, otherwise we get failing builds. It looks like gitlab runner is configured with using local images. Is this correct?

Edited by Leon Botros

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