manually install pip, ACTUALLY on Windows

Author: harisont

.github/workflows/build-binary-packages.yml

@@ -191,7 +191,13 @@ jobs:
       if: false
 
     # - uses: actions/setup-python@v5
-
+    - name: Install pip
+      shell: msys2 {0}
+      run: |
+        curl https://bootstrap.pypa.io/get-pip.py
+        python get-pip.py
+        rm get-pip.py
+        
     - name: Build Python bindings
       shell: msys2 {0}
       env: