Fix AMD ROCm install regression in speedrun.sh

Explicitly pass `--extra $EXTRAS` to `uv run` when building the tokenizer.
This prevents `uv` from reverting to the default (NVIDIA) dependency set
during the `maturin` build step, ensuring the correct PyTorch version
(ROCm) is preserved on AMD hardware.

speedrun.sh

@@ -67,7 +67,7 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
 source "$HOME/.cargo/env"
 
 # Build the rustbpe Tokenizer
-uv run maturin develop --release --manifest-path rustbpe/Cargo.toml
+uv run --extra $EXTRAS maturin develop --release --manifest-path rustbpe/Cargo.toml
 
 # Download the first ~2B characters of pretraining dataset
 # look at dev/repackage_data_reference.py for details on how this data was prepared