(temporary) add pyyaml to unittest requirements (#5099)

* (temporary) add pyyaml to unittest requirements

* add actionable comments

Author: pmeier

.circleci/unittest/linux/scripts/environment.yml

@@ -9,6 +9,8 @@ dependencies:
   - libpng
   - jpeg
   - ca-certificates
+  # TODO: remove this after https://github.com/pytorch/pytorch/issues/69905 is resolved
+  - pyyaml
   - pip:
     - future
     - pillow >=5.3.0, !=8.3.*

.circleci/unittest/windows/scripts/environment.yml

@@ -9,6 +9,8 @@ dependencies:
   - libpng
   - jpeg
   - ca-certificates
+  # TODO: remove this after https://github.com/pytorch/pytorch/issues/69905 is resolved
+  - pyyaml
   - pip:
     - future
     - pillow >=5.3.0, !=8.3.*