fix the failing workflow

Author: Tieqiong

.github/workflows/main.yml

@@ -35,6 +35,7 @@ jobs:
         run: |
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
+          conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
           python -m pip install . --no-deps
 

.github/workflows/matrix.yml

@@ -40,6 +40,7 @@ jobs:
         run: |
           conda install --file requirements/run.txt
           conda install --file requirements/test.txt
+          conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
           python -m pip install . --no-deps