Remove v0.2 of SLSA as no longer supported

Romuald Atchadé - OOO until Jan 11th, 2026requested to merge
slsa-remove-v0.2-version into main

What does this MR do?

It removes v0.2 from the provenance.md as it is no longer supported.

Refers to MR: gitlab!183813 (merged)

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