obs/re6st: fix dependency of rpm and arch in case we use SLAPOS_EPOCH

the VERSION variable is calculated in wheel() which is called by
tarball.
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failed ERP5.StandaloneDeploymentScriptTest-Debian.Bulleseye.JEROME

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passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

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passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Bullseye

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

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passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

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