🌱 use sha256 thumbprint in tests

[chrischdi]

What this PR does / why we need it:

sha1 support for certificates gets removed in Go 1.24 (xref).

Due to its insecurity we should also use sha256 for thumbprints to ensure this works.

Note: govmomi directly verifies the thumbprint and does not use the library for it, so its not going to break with v1.24.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[chrischdi]

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[chrischdi]

/test pull-cluster-api-provider-vsphere-e2e-vcsim-govmomi-main
/test pull-cluster-api-provider-vsphere-e2e-vcsim-supervisor-main

[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: a760df79c0797f84da26a7f1e3c7c7d638bea796

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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