CI: proper version checking for v1.31.2 version testing

[BBBmau]

The branch check was not done correctly. This PR corrects the mistake from #2619

GHA runs can be found here:

Checks for main, runs all k8s versions except for v1.31.2: https://github.com/BBBmau/terraform-provider-kubernetes/actions/runs/11844946716

Checks for v3-main-release, all k8s version including v1.31.2 are ran: https://github.com/BBBmau/terraform-provider-kubernetes/actions/runs/11844947578

References

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[JaylonmcShan03]

Thanks for this :)