use older scipy on windows release

pyinstaller seem to strugle with scipy > 1.4.x

.github/workflows/release_win.yml

@@ -6,7 +6,7 @@ on:
       - v*
 
 jobs:
-  release:  
+  release:
     runs-on: windows-latest
     strategy:
       matrix:
@@ -17,12 +17,12 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8 
+        python-version: 3.8
         architecture: ${{ matrix.arch }}
     - name: Install dependencies and pyinstall
       run: |
         python -m pip install --upgrade pip setuptools
-        pip install -r requirements.txt
+        pip install -r requirements_win.txt
         pip install PyInstaller==3.6
     - name: Build binary
       run: |

NanoVNASaver/About.py

@@ -17,7 +17,7 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-VERSION = "0.3.8-rc01"
+VERSION = "0.3.8-rc02"
 VERSION_URL = (
     "https://raw.githubusercontent.com/"
     "NanoVNA-Saver/nanovna-saver/master/NanoVNASaver/About.py")

requirements_win.txt

@@ -0,0 +1,5 @@
+scipy==1.4.1
+cython
+pyqt5
+pyserial
+numpy