Raise nbval cell timeout for tutorial notebooks to 360s

The trajectory-optimization tutorials (e.g. 03/03/04 mission performance)
run IPOPT solves that exceed 120s on cold 2-core CI runners; nbval's
timeout interrupt lands inside the CasADi solve and surfaces as
NonIpopt_Exception_Thrown, failing the job flakily per Python version.
The tutorials step had been masked since Dec 2025 by the (now-fixed)
package-test failures, so this only appeared once CI went green upstream.

Author: peterdsharpe

.github/workflows/run-pytest.yml

@@ -31,4 +31,4 @@ jobs:
           uv run --python ${{ matrix.python-version }} --extra test --no-dev pytest aerosandbox
       - name: Test with pytest (with extras; only tutorials)
         run: |
-          uv run --python ${{ matrix.python-version }} --extra test --extra full pytest tutorial --nbval-lax --nbval-cell-timeout 120
+          uv run --python ${{ matrix.python-version }} --extra test --extra full pytest tutorial --nbval-lax --nbval-cell-timeout 360