build(deps): revert all post-bc1394b dependency bumps

[gregorydemay]

Summary

Restore Cargo.toml and Cargo.lock to their state at commit bc1394b (2026-04-21, the last commit on main where CI passed). Seven Dependabot bumps merged in succession after that point left main red because branch protection on this repo doesn't currently gate on status checks (only on approval + CODEOWNERS), so each bump merged without ever passing CI:

• build(deps): bump ic-agent from 0.46.2 to 0.47.1 #99 ic-agent 0.46.2 → 0.47.1
• build(deps): bump uuid from 1.22.0 to 1.23.0 #100 uuid 1.22.0 → 1.23.0
• build(deps): bump ic-management-canister-types from 0.5.0 to 0.7.1 #101 ic-management-canister-types 0.5.0 → 0.7.1 — likely root cause: triggers E0308: mismatched types in lint
• build(deps): bump proptest from 1.10.0 to 1.11.0 #102 proptest 1.10.0 → 1.11.0
• build(deps): bump pocket-ic from 12.0.0 to 13.0.0 #103 pocket-ic 12.0.0 → 13.0.0
• build(deps): bump rustls-webpki from 0.103.10 to 0.103.12 #106 rustls-webpki 0.103.10 → 0.103.12
• build(deps): bump rustls-webpki from 0.103.12 to 0.103.13 #107 rustls-webpki 0.103.12 → 0.103.13

Reverting all seven in one go restores main to the known-green state. Each upgrade can be re-applied individually once branch protection is configured to require CI to pass.

Mirrors the analogous fix in dfinity/sol-rpc-canister#321.

Branch protection follow-up

The aggregator PR (#113) adds a checks-pass job, and after both PRs land an admin needs to add a required_status_checks rule listing checks-pass (mirroring what's already in place on bitcoin-canister, dogecoin-canister, dex, sol-rpc-canister, ledger-faucet, exchange-rate-canister, crosschain-wallet). Tracked via DEFI-2807.