removed old linux support

.github/workflows/release_linux.yml

@@ -1,39 +0,0 @@
-name: Linux Release
-
-on:
-  push:
-    tags:
-      - v*
-  workflow_dispatch:
-
-jobs:
-  release:
-    runs-on: ubuntu-20.04
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-    - name: Install python
-      run: |
-        sudo apt-get update
-        sudo apt install -y python3.9 python3-pip python3.9-venv \
-          python3.9-dev
-    - name: Install dependencies and pyinstall
-      run: |
-        python3.9 -m venv build
-        . build/bin/activate
-        python -m pip install pip==23.2.1 setuptools==68.0.0
-        pip install -r requirements.txt
-        pip install PyInstaller==5.13.0
-    - name: Build binary
-      run: |
-        . build/bin/activate
-        python setup.py -V
-        pyinstaller --onefile -p src -n nanovna-saver nanovna-saver.py
-    - name: Archive production artifacts
-      uses: actions/upload-artifact@v1
-      with:
-        name: NanoVNASaver.linux
-        path: dist/nanovna-saver

flatpak.manifest.yml

@@ -11,8 +11,7 @@ modules:
     buildsystem: simple
     build-commands:
       - pip3 install --prefix=/app wheel setuptools setuptools-scm
-      # - pip3 install --prefix=/app git+https://github.com/NanoVNA-Saver/nanovna-saver.git
-      - pip3 install --prefix=/app git+https://github.com/zarath/nanovna-saver.git@feature/pip_updates
+      - pip3 install --prefix=/app git+https://github.com/NanoVNA-Saver/nanovna-saver.git
 finish-args:
   # X11 + XShm access
   - --share=ipc