replaced pythonocc-core=7.4.0 with pythonocc-core

Author: kshitij-maths

.github/workflows/testing_pr.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Installing packages
       shell: bash -el {0}
       run: |
-        conda install --yes -c conda-forge pythonocc-core=7.4.0
+        conda install --yes -c conda-forge pythonocc-core
         python -m pip install --upgrade pip
         python -m pip install .[test]