Update Makefile and GH actions

.github/workflows/test.yml

@@ -21,12 +21,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install xpress
-        python -m pip install -i https://pypi.gurobi.com gurobipy
-        pip install -r requirements.txt
+      run: make install-deps
 
     - name: Test
-      run: |
-        make test
+      run: make test

Makefile

@@ -27,9 +27,10 @@ docs:
 
 
 install-deps:
-	$(PIP) install -i https://pypi.gurobi.com gurobipy
-	$(PIP) install xpress
-	$(PIP) install -r requirements.txt
+	$(PIP) install --upgrade pip
+	$(PIP) install --upgrade -i https://pypi.gurobi.com gurobipy
+	$(PIP) install --upgrade xpress
+	$(PIP) install --upgrade -r requirements.txt
 
 install:
 	$(PYTHON) setup.py install