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ARROW-9511: [Packaging][Release] Set conda packages' build number to 0

The artifacts patterns in the crossbow tasks definitions expect conda packages with build number 0. We should keep the build number always zero in the vendored conda-forge recipes.

Closes #7790 from kszucs/conda-build-number

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>