scaleway/compute-instance v3.0.0

PD-0110 moved modules/ to templates/terraform/ and cut one tag per module under the new prefix to continue each module's version lineage there. This version's own GitHub Release describes it as "Bookkeeping only -- same tree content as the move commit, no resource/behavior change", following the same pattern PD-0093 used for its own prior move. The tag and its Release were created with PR #144; only the changelog entry was missed, which is what this backfills by hand, since the automation writes entries from PR bodies alone.

No behaviour change. This version's instance.tf, inputs.tf, outputs.tf and versions.tf are byte-identical to v2.3.4's. The major bump records a change to the module's source path only: a module's source path is part of its public interface, so relocating it is breaking for every consumer regardless of whether any resource definition changed (PD-0093, PD-0110).

Consumers pinning v2.3.4 and v3.0.0 resolve identical module content; the difference is which repo and tag the short URL resolves to.

#144