Retry python-pyproj (2.0.0+ds-1~exp1) with proj (6.0.0-1~exp2) in experimental

[Sebastiaan Couwenberg]

When python-pyproj was uploaded to experimental, the build of proj
(6.0.0-1~exp2) wasn't installed on all architectures yet. That second
version is required to properly pull in proj-data (>= 6.0.0) via the
libproj-dev (>= 6.0.0) build dependency.

 dw python-pyproj_2.0.0+ds-1~exp1 . ANY -amd64 -arm64 -armhf -ppc64el \
 -s390x -powerpcspe . experimental . -m 'libproj-dev (>= 6.0.0-1~exp2)'

Kind Regards,

Bas

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