Add pyyaml as PyTorch runtime dep (#1394)

Companion PR to pytorch/pytorch#100166

Author: zou3519

conda/pytorch-nightly/meta.yaml

@@ -47,6 +47,7 @@ requirements:
     - filelock
     - networkx
     - jinja2 # [py <= 310]
+    - pyyaml
     {% if cross_compile_arm64 == 0 %}
     - blas * mkl
     {% endif %}