Remove python installation from MacOS builds

we don't use any pip deps in this workflow.

Author: lukaszstolarczuk

.github/workflows/basic.yml

@@ -440,9 +440,6 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: Install Python requirements
-      run: python3 -m pip install -r third_party/requirements.txt
-
     - name: Install hwloc
       run: brew install hwloc jemalloc tbb