chore(celestia-node-fiber): bump celestia-node + celestia-app to latest fibre

[walldiss]

Summary

Bumps the tools/celestia-node-fiber go.mod to track refreshed Fibre branches:

• celestia-node feature/fibre-experimental @ 9adc59e0 — rebuilt from feature/fibre HEAD (be006cb4 "add state client #4987") + the existing celestia-app dep bump.
• celestia-app feat/fibre-payments @ 5abc6308 — rebuilt from current main (760d4807) + PR #7190 "perf(fibre): flat-file shard store for fibre" merged on top. PR #7190 remains open upstream for normal review.

Also bumps the gnark-crypto replace directive target from v0.18.0 → v0.20.1 to mirror what celestia-node had to bump (celestia-app/main pulled in gnark 0.14 → 0.15 via celestiaorg/celestia-app#7279, which requires the new gnark-crypto). No direct uses of gnark-crypto in either repo — alignment only.

Why

x402-risotto (and downstream Fibre testnet) needs the PR #7190 perf changes to land on the testnet stack ASAP. This is the propagation step: celestia-app → celestia-node → ev-node (julien/fiber) → risotto/evolve. After this PR merges, the matching x402-risotto evolve/go.mod bump goes up next.

Scope

Only tools/celestia-node-fiber/go.mod and go.sum are touched. Root go.mod has no celestia-app/celestia-node deps and is unchanged.

Backups

Previous heads preserved on origin in case rollback is needed:

• celestia-app: backup/feat-fibre-payments-pre-7190-merge (was fe8cb867)
• celestia-node: backup/feature-fibre-experimental-pre-bump (was 23bec13f)

Test plan

• `go mod tidy` in `tools/celestia-node-fiber` clean
• `go build ./...` in `tools/celestia-node-fiber` clean
• CI on this PR
• x402-risotto smoke test via run-stack.sh (follow-up PR)

cc @julienrbrt — branch `julien/fiber` target.

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