test: Fix UnicodeDecodeError during OpenShift image build
test: Fix UnicodeDecodeError during OpenShift image build

https://api.github.com/repos/openshift/origin/releases contains fancy
non-ASCII quotes which aren't representable in the ASCII "C" locale. Run
python under C.UTF-8 to fix an UnicodeDecodeError during image build.

Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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