actions: update to use @main version

Author: clstaudt

.github/workflows/flet-pack.yml

@@ -14,8 +14,8 @@ jobs:
         os: ["macos-latest", "windows-latest"]
 
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
+    - uses: actions/checkout@main
+    - uses: actions/setup-python@main
       with:
         python-version: 3.10.7
     - run: pip install -r requirements.txt
@@ -24,7 +24,7 @@ jobs:
     - run: python scripts/pack_app.py
     # Optionally verify that it works (provided that it does not need user interaction)
     #- run: ./dist/your-code/your-code
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@main
       with:
         name: Tuttle-${{ github.sha }}-${{ matrix.os }}
         path: dist/