[Misc] Use old pydantic yaml version for CI. (#6009)

Co-authored-by: Ubuntu <ubuntu@ip-172-31-28-63.ap-northeast-1.compute.internal>

tests/scripts/task_distributed_test.sh

@@ -35,7 +35,7 @@ export OMP_NUM_THREADS=1
 export DMLC_LOG_DEBUG=1
 
 # Install required dependencies
-python3 -m pip install pydantic-yaml
+python3 -m pip install pydantic-yaml==0.11.2
 
 python3 -m pytest -v --capture=tee-sys --junitxml=pytest_distributed.xml --durations=100 tests/distributed/*.py || fail "distributed"
 

tests/scripts/task_unit_test.bat

@@ -14,7 +14,7 @@ SET DGLBACKEND=!BACKEND!
 SET DGL_LIBRARY_PATH=!CD!\build
 SET DGL_DOWNLOAD_DIR=!CD!
 
-python -m pip install pytest psutil pandas pyyaml pydantic pydantic-yaml rdflib torchmetrics || EXIT /B 1
+python -m pip install pytest psutil pandas pyyaml pydantic pydantic-yaml==0.11.2 rdflib torchmetrics || EXIT /B 1
 python -m pytest -v --junitxml=pytest_backend.xml --durations=100 tests\python\!DGLBACKEND! || EXIT /B 1
 python -m pytest -v --junitxml=pytest_common.xml --durations=100 tests\python\common || EXIT /B 1
 ENDLOCAL

tests/scripts/task_unit_test.sh

@@ -34,7 +34,7 @@ fi
 conda activate ${DGLBACKEND}-ci
 
 # Install required dependencies
-python3 -m pip install pydantic-yaml
+python3 -m pip install pydantic-yaml==0.11.2
 
 if [ $DGLBACKEND == "mxnet" ]
 then