Fix flatcar vagrant for Kubernetes 1.26

[ccojocar]

Fix flatcar vagrant for Kubernetes 1.26

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fixes the vagrant for Flatcar Linux to work with Kubernetes 1.26 which requires containerd 1.6.x which is only available in Flatcar sable stream.

Also we have to use a temporary vagrant box because there was still an issue with ssh which was fixed by Flatcar but not yet released.

See for details: flatcar/Flatcar#916

Which issue(s) this PR fixes:

Fixes #1377

Does this PR have test?

Yes

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Fix vagrant for Flatcar Linux to work with Kubernetes 1.26.

[ccojocar]

/assign @saschagrunert @jhrozek

[codecov-commenter]

Codecov Report

Merging #1392 (2ff4614) into main (9108c0a) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1392   +/-   ##
=======================================
  Coverage   44.21%   44.21%           
=======================================
  Files          50       50           
  Lines        5640     5640           
=======================================
  Hits         2494     2494           
  Misses       3026     3026           
  Partials      120      120           

[ccojocar]

/test e2e-flatcar

[k8s-ci-robot]

@ccojocar: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test pull-security-profiles-operator-build
• /test pull-security-profiles-operator-build-image
• /test pull-security-profiles-operator-test-e2e
• /test pull-security-profiles-operator-test-unit
• /test pull-security-profiles-operator-verify

Use /test all to run all jobs.

In response to this:

/test e2e-flatcar

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ccojocar]

/test pull-security-profiles-operator-test-e2e

[ccojocar]

/test all

[JAORMX]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ccojocar, JAORMX

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [JAORMX]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment