chore(nightly): bump to v4.4.0-nightly.20260521

[AztecBot]

Nightly bump: v4.3.0-rc.1 -> v4.4.0-nightly.20260521

Automated nightly bump driven by the upstream tagging workflow.

• Source run: https://github.com/AztecProtocol/aztec-packages/actions/runs/26271951076 (nightly-release-tag-v4-next.yml, conclusion success, head_sha 87aa5283d5b0cab6632ed49fdd25f6548d2ba91f)
• New nightly: v4.4.0-nightly.20260521 (latest @aztec/aztec.js nightly on npm)

What changed

• scripts/update.js rewrote every workspace package.json (@aztec/* deps) and every Nargo.toml git tag to v4.4.0-nightly.20260521, refreshed yarn.lock, and recompiled the Aztec contracts.
• apps/swap/src/config/networks/testnet.json updated with the freshly deployed testnet contract addresses and subscriptionFPC signups.

Verification (success path — no migration fixes needed)

• yarn build passed
• yarn test passed (10/10 turbo tasks, e2e 6/6)
• yarn setup:testnet passed

Testnet deployment (yarn setup:testnet)

Deployed against https://rpc.testnet.aztec-labs.com (chain 11155111, rollup version 4127419662):

Contract	Address
Swap admin (deployer)	0x1988c289f9d7c63534d81e926e0f647c2973bba622bbe689385426848104ccef
GoCoin (Token)	0x2f9997e68f9b47e2c5b82374d2817477f15cfd533a8b655094450c2fbfef0fc2
GoCoinPremium (Token)	0x2c3f116310c2ea0c791c87dd8abd5515c17ba0263e37c5df4dfec26f3b6ac23f
AMM	0x01a3ac56dc2b6a87b684dd6ca74978055c634aedcc87a44e1600dc21fa135576
Liquidity token	0x2ac877b1239238f34dba4b96f4c5a83eafb45d7fc05b14f4b11e686ca221f748
ProofOfPassword	0x201786637d7878c5e59ed7d3132fbab4f80e703322d377b424a197ea7ec23afe
SubscriptionFPC	0x10934049de259d9650dcce45dd94b10b69b33cbdda43721bb2de89ceb38b8164
FPC admin	0x2dd1cfa313c08b889971cc9f25450ab3fbdd313f65ff2b74bba33c3eb90d418e
SponsoredFPC (canonical)	0x08b888c4be63ed67f61a622fdd013ea028326bac22a8982a3b5a7e9ec62f765b

FPC signups registered for: pop.check_password_and_mint, amm.swap_tokens_for_exact_tokens_from, goCoin.transfer_in_private_deliver_offchain, goCoinPremium.transfer_in_private_deliver_offchain.

Commit shape: single commit (success path).

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Created by claudebox session 348fb07e227e4e75.