Fix typo in PODMAN_VERSION variable name

[kikitux]

PODMAN_VERION -> PODMAN_VERSION

Fix typo on README.md for PODMAN_VERSION variable

None

[openshift-ci]

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[baude]

@kikitux you need to sign your commit ... git commit --amend -s && git push -f ....

[baude]

also thank you for the PR