[release-1.33] fix: CVE-2026-56855

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: CVE-2026-56855

┌────────────────────────┬────────────────┬──────────┬────────┬───────────────────┬───────────────┬─────────────────────────────────────────────────────────────┐
  │        Library         │ Vulnerability  │ Severity │ Status │ Installed Version │ Fixed Version │                            Title                            │
  ├────────────────────────┼────────────────┼──────────┼────────┼───────────────────┼───────────────┼─────────────────────────────────────────────────────────────┤
  │ golang.org/x/crypto    │ CVE-2026-56855 │ UNKNOWN  │ fixed  │ v0.55.0           │ 0.56.0        │ Prevent DoS on deadlocked established channel in            │
  │                        │                │          │        │                   │               │ golang.org/x/crypto/ssh                                     │
  │                        │                │          │        │                   │               │ https://avd.aquasec.com/nvd/cve-2026-56855                  │
  │                        ├────────────────┤          │        │                   │               ├─────────────────────────────────────────────────────────────┤
  │                        │ CVE-2026-78662 │          │        │                   │               │ Prevent DoS on deadlocked undecided channel in              │
  │                        │                │          │        │                   │               │ golang.org/x/crypto/ssh                                     │
  │                        │                │          │        │                   │               │ https://avd.aquasec.com/nvd/cve-2026-78662                  │
  ├────────────────────────┼────────────────┼──────────┤        ├───────────────────┼───────────────┼─────────────────────────────────────────────────────────────┤
  │ google.golang.org/grpc │ CVE-2026-84304 │ HIGH     │        │ v1.82.1           │ 1.83.1        │ gRPC-Go is the Go language implementation of gRPC. Prior to │
  │                        │                │          │        │                   │               │ 1.83.1, in...                                               │
  │                        │                │          │        │                   │               │ https://avd.aquasec.com/nvd/cve-2026-84304                  │
  └────────────────────────┴────────────────┴──────────┴────────┴───────────────────┴───────────────┴─────────────────────────────────────────────────────────────┘

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[kubernetes-prow]

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[landreasyan]

/lgtm