docs: update setup and test docs with missing info

docs/src/guides/development.md

@@ -123,6 +123,12 @@ Commands:
 
 ### Running unit tests
 
+Unit tests require preprocessed artifacts from the contracts submodule. These can be prepared by running:
+
+```bash
+zkstack dev contracts
+```
+
 You can run unit tests for the Rust crates in the project by running:
 
 ```bash

docs/src/guides/setup-dev.md

@@ -41,7 +41,7 @@ npm install -g yarn
 yarn set version 1.22.19
 
 # For running unit tests
-cargo install cargo-nextest
+cargo install cargo-nextest --version 0.9.109 --locked
 # SQL tools
 cargo install sqlx-cli --version 0.8.1