ci: simplify sanitizer test workflow

Author: ntamas

.github/workflows/build.yml

@@ -331,22 +331,11 @@ jobs:
         with:
           python-version: "3.12"
 
-      - name: Install test dependencies
-        run: |
-          pip install --prefer-binary pytest pytest-timeout setuptools
-
-      - name: Build C core
-        env:
-          IGRAPH_USE_SANITIZERS: 1
-        run: |
-          python setup.py build_c_core
-
       - name: Build and install Python extension
         env:
           IGRAPH_USE_SANITIZERS: 1
         run: |
-          # NOTE: install calls "build" first
-          python setup.py install
+          pip install --prefer-binary '.[test]'
 
       # Only pytest, and nothing else should be run in this section due to the presence of LD_PRELOAD.
       # The ASan/UBSan library versions need to be updated when switching to a newer Ubuntu/GCC.