chore(deps): backport go-libs migrator index name fix to release/v2.6

[Dav-14]

Summary

Backport of the go-libs migrator index name fix to flows `release/v2.6`. Bumps `github.com/formancehq/go-libs/v3` from `v3.3.0` to `v3.6.2`.

Pulls in formancehq/go-libs#596 (backport of #594 to `release/v3.6`) which fixes a hardcoded `idx_version_id` name collision between migrators sharing a schema. The bug crashes services with `SQLSTATE 42P10` at startup. Affected DBs self-heal on next deploy — no manual SQL required.

Used by the v3.2 stack in regions chart (orchestration v2.6.0).

Companion to #171 (main, still open).

Test plan

• `go mod tidy` clean
• `go build ./...` succeeds
• CI green

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