Update github.com/hashicorp/go-retryablehttp for CVE-2024-6104

[joelsmith]

This library is only used (indirectly) by the New Relic scaler. It's unclear if KEDA is even affected by the issue (unsanitized logging) but it's good code hygiene to fix it either way.

$ go get -u github.com/hashicorp/go-retryablehttp
go: downloading github.com/hashicorp/go-retryablehttp v0.7.7
go: downloading github.com/hashicorp/go-hclog v1.6.3
go: upgraded github.com/hashicorp/go-hclog v1.6.2 => v1.6.3
go: upgraded github.com/hashicorp/go-retryablehttp v0.7.5 => v0.7.7
$ go mod tidy
go: downloading github.com/jstemmer/go-junit-report/v2 v2.1.0
$ go mod vendor

Checklist

• I have verified that my change is according to the deprecations & breaking changes policy
• Changelog has been updated and is aligned with our changelog requirements
• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Fixes #5944

[zroubalik]

/run-e2e relic
Update: You can check the progress here