website: Updating GSOC 2025 to past event

[dhanishaphadate]

Description of Changes

Move Google Summer of Code 2025 Google Summer of Code 2025. to past event from future event section.

Related Issues

Closes: #4244

Related: #

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[google-oss-prow]

Hi @dhanishaphadate. Thanks for your PR.

I'm waiting for a kubeflow 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. Regular contributors should join the org to skip this step.

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[dhanishaphadate]

Screenshot of the change

[jaiakash]

Looks good.

[Arhell]

/ok-to-test