[release-4.19] Replace golang.org/x/crypto with sustaining fork for CVE-2026-39829

[atewari-rh]

What

Replaces golang.org/x/crypto with the sustaining team's patched fork
(github.com/openshift-sustaining/crypto@v0.41.0-sec.3) to fix
CVE-2026-39829 — a DoS in
golang.org/x/crypto/ssh from unbounded RSA/DSA key parameters.

Why a fork

Upstream fix is in v0.52.0, but that requires a newer Go toolchain than release-4.19
carries (go 1.23.0). The fork backports the fix without a Go bump:

```
go mod edit -replace golang.org/x/crypto=github.com/openshift-sustaining/crypto@v0.41.0-sec.3
go mod tidy && go mod vendor
```

Changes

• go.mod: added the replace directive + transitive bumps pulled in by the fork's go.mod
• vendor/golang.org/x/crypto/**, vendor/modules.txt: regenerated via go mod vendor
• No Go version/toolchain change, no application source changes

Testing

• make build / go build -mod=vendor ./... — clean
• vendor/golang.org/x/crypto/ssh/keys.go contains the patched 8192-bit RSA modulus check
• make test: 17/18 test functions pass. TestDefaultAzureProviderSpec fails on arm64
  hosts only — pre-existing, unrelated bug (test doesn't account for arch == ARM64 logic
  in machine_webhook.go). Confirmed via git stash this fails identically without this
  change too; not release-blocking since CI runs on amd64.

Related: OCPBUGS-89943

[openshift-merge-bot]

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[openshift-ci]

Hi @atewari-rh. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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