chore(deps): bump bitnami/kubectl in /test/container (argoproj#20191)

Bumps bitnami/kubectl from `da4a986` to `b509ab6`.

---
updated-dependencies:
- dependency-name: bitnami/kubectl
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dan Garfield <dan@codefresh.io>
Signed-off-by: Adrian Aneci <aneci@adobe.com>

test/container/Dockerfile

@@ -12,7 +12,7 @@ FROM docker.io/library/golang:1.23.1@sha256:4f063a24d429510e512cc730c3330292ff49
 
 FROM docker.io/library/registry:2.8@sha256:ac0192b549007e22998eb74e8d8488dcfe70f1489520c3b144a6047ac5efbe90 as registry
 
-FROM docker.io/bitnami/kubectl:1.31@sha256:da4a9868e20d941636087cb8624a4bb441f5249d69e8f3d27e53c7d4d280a5f3 as kubectl
+FROM docker.io/bitnami/kubectl:1.31@sha256:b509ab6000477ebe788df3509a8c4177e91238ee3003f33edea0931be3794340 as kubectl
 
 FROM docker.io/library/ubuntu:24.04@sha256:3f85b7caad41a95462cf5b787d8a04604c8262cdcdf9a472b8c52ef83375fe15