Fix nightly build: bump ethnum to 1.5.3 - #50
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ethnum 1.5.1 fails to compile on current Rust stable with error[E0512] (invalid transmute of TryFromIntError) in its error.rs, which broke every nightly build since 2026-07-09. The nightly workflow uses an unpinned stable toolchain, so a Rust release started tripping the bad transmute. ethnum 1.5.3 fixes it; this is a lockfile-only, semver-compatible bump (ethnum is a transitive dep via polars).
crates/datui-pyo3 is excluded from the workspace and keeps its own Cargo.lock, so the root-level ethnum bump didn't reach it. Its lock pinned ethnum 1.5.2, which still has the E0512 transmute bug (the fix only landed in 1.5.3) — so the maturin develop step in CI kept failing with the same error. Bump the pyo3 lockfile to 1.5.3 as well.
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Problem
```
error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
--> ethnum-1.5.1/src/error.rs:16:14
note: target type: `TryFromIntError` (8 bits)
error: could not compile `ethnum` (lib) due to 1 previous error
```
`ethnum` v1.5.1 (a transitive dependency via polars) contains an invalid `transmute` in its error handling. A recent Rust stable release changed the layout of `std::num::TryFromIntError`, so the transmute no longer type-checks and the crate fails to build.
Fix
`cargo update -p ethnum` → 1.5.1 → 1.5.3 (1.5.2+ fixes the transmute). Lockfile-only, semver-compatible bump; no `Cargo.toml` change. This keeps us building on current stable rather than pinning around the problem.
Verification