Fix: use extras correctly in uv run

Author: clbarnes

.github/workflows/validation.yml

@@ -10,4 +10,4 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - uses: astral-sh/setup-uv@v9.0.0
-      - run: uv run pytest -v
+      - run: uv run --extra testing pytest -v

justfile

@@ -9,11 +9,11 @@ build:
 # Check spelling in the source files;
 # configured in pyproject.toml.
 spell:
-    uv run codespell
+    uv run --extra testing codespell
 
 # Run all lint commands.
 lint: spell
 
 # Run schema tests.
 test:
-    uv run pytest -v
+    uv run --extra testing pytest -v