fix(ci): retry sqlite3mc-wasm download on transient DNS/TLS failures

[AztecBot]

Motivation

The merge-train/spartan train PR (#23253) was dequeued from the merge queue this morning because grind run x9 failed during compile_all:

==> Downloading sqlite3mc-2.2.4-sqlite-3.50.4-wasm.zip
curl: (6) Could not resolve host: release-assets.githubusercontent.com

CI logs:

• compile_all: http://ci.aztec-labs.com/dea5c9f3fde10614
• x9-full driver: http://ci.aztec-labs.com/1778928278029512
• merge-queue run: https://github.com/AztecProtocol/aztec-packages/actions/runs/25959931160

The branch CI on the same commit (run 25958983932) passed — only one of the 10 grind shards hit the DNS flake, but the merge-queue fail-fast tore the whole run down. The other 9 grinds and the ARM run were still pending when the queue dropped #23253.

Approach

Add curl retry flags to yarn-project/sqlite3mc-wasm/scripts/vendor.sh so a one-off Could not resolve host (or any other transient curl failure) doesn't fail the build. --retry 5 --retry-delay 2 --retry-all-errors --retry-connrefused gives ~10s of total backoff, which is plenty for a momentary DNS hiccup but bounded for genuine outages.

This is the only curl in the yarn-project build path that hits GitHub release assets, so this is a targeted fix rather than a sweep.

Verification

./bootstrap.sh ci requires EC2 spawn and isn't runnable from inside the container. Locally verified that vendor.sh ensure still downloads and validates the pinned artifact correctly.

ClaudeBox log: https://claudebox.work/s/89dacb14037285cd?run=1

[AztecBot]

Flakey Tests

🤖 says: This CI run detected 2 tests that failed, but were tolerated due to a .test_patterns.yml entry.

\033FLAKED\033 (8;;http://ci.aztec-labs.com/fcf14f1f9ad9a117�fcf14f1f9ad9a1178;;�):  yarn-project/end-to-end/scripts/run_test.sh simple src/e2e_p2p/preferred_gossip_network.test.ts (213s) (code: 0) group:e2e-p2p-epoch-flakes
\033FLAKED\033 (8;;http://ci.aztec-labs.com/14a2168e27865c3e�14a2168e27865c3e8;;�): yarn-project/kv-store/scripts/run_test.sh src/sqlite-opfs/internal/ordered-binary-browser.test.ts (2s) (code: 0)