Require the same version we replace for prometheus

[GraceAtwood]

hey yall! We recently took a dependency on github.com/kedacore/keda/v2

But that's now causing all our IDEs to break with

go list -modfile=go.mod -m -json -mod=mod all
go: [github.com/prometheus/[email protected]](http://github.com/prometheus/[email protected]): invalid version: unknown revision 000000000000

seems like it's due to this line here

keda/go.mod

Line 80 in e23ef46

github.com/prometheus/prometheus v0.0.0-00010101000000-000000000000

I asked that ^ question in Slack and @JorTurFer asked that I open this PR

Provide a description of what has been changed

So this just changes the require line to match what we're replacing so that when downstream projects take a dependency on keda, they don't import a bad version.

Checklist

• When introducing a new scaler, I agree with the scaling governance policy
• I have verified that my change is according to the deprecations & breaking changes policy
• Tests have been added
• Changelog has been updated and is aligned with our changelog requirements
• A PR is opened to update our Helm chart (repo) (if applicable, ie. when deployment manifests are modified)
• A PR is opened to update the documentation on (repo) (if applicable)
• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Relates to #
https://kubernetes.slack.com/archives/CKZJ36A5D/p1747927855084599

[JorTurFer]

Thanks!