Run flynt (https://pypi.org/project/flynt/) on pystencils

This replaces usages of "" % s by Python's f-strings
6 jobs for try-flynt in 7 minutes and 21 seconds (queued for 2 minutes and 42 seconds)
latest
Status Job ID Name Coverage
  Test
passed #287354
cuda docker
build-documentation

00:00:49

passed #287353
cuda docker
flake8-lint

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passed #287352
docker
minimal-conda

00:00:40

passed #287351
docker
minimal-ubuntu

00:00:53

passed #287350
win
minimal-windows

00:01:31

passed #287349
AVX cuda docker
tests-and-coverage

00:03:41