[argparse] update library

[elpaso]

Update to PR p-ranav/argparse#356

Also fixes the incompatibility between store_into and scan and action: when the three methods above were called, being all based on the (unique) action, the last one would overwrite the previous ones.

This issue was making the parser strictly dependent on the order of the scan/store_into/action calls making them mutually exclusive.

[rouault]

The test failure might require to apply #10093 first

[elpaso]

The test failure might require to apply #10093 first

I think that the issue comes from .scan<'g', double>(), before the changes p-ranav/argparse#356 because .scan was internally implemented as an .action and only the last action was actually stored, .scan was completely ignored.

Now, after p-ranav/argparse#356 you can call multiple .actions and they will be executed in order.

.scan is not compatible with the -burn variants because it expects a single double. I think the solution here is to remove the scan.

[coveralls]

coverage: 69.067% (-0.08%) from 69.148%
when pulling 9ebbe54 on elpaso:argparse-update
into 6fc7fe1 on OSGeo:master.