use PyInstaller 4.4 (#564)

.github/workflows/build-multi-os.yml

@@ -40,7 +40,7 @@ jobs:
     - name: Get firmware version matching manifest
       run: |
         echo ${{ steps.vars.outputs.manifest }}
-        available=$(curl -s https://github.com/AllYarnsAreBeautiful/ayab-firmware/releases | grep -oE '/tag/[^\"]+' | sed -E 's/\/tag\///') 
+        available=$(curl -s https://github.com/AllYarnsAreBeautiful/ayab-firmware/releases | grep -oE '/tag/[^\"]+' | sed -E 's/\/tag\///')
         echo $available
         match=$(for x in $available; do echo $x; done | grep ^${{ steps.vars.outputs.manifest }} | sort -r | head -1)
         echo $match
@@ -69,6 +69,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
+        sudo apt update
         sudo apt-get install -y avrdude libasound2-dev
     - name: Restore pip cache
       id:   pip-cache

requirements.txt

@@ -1,6 +1,6 @@
 fbs @ git+https://github.com/AllYarnsAreBeautiful/fbs@1.2.1-py38
 PyQt5==5.12.3
-PyInstaller==4.1
+PyInstaller==4.4
 Pillow==7.1.2
 pyserial==3.4
 sliplib==0.4.0