ci update upload-artifact action to v7

Author: rtlopez

.github/workflows/platformio.yml

@@ -91,13 +91,13 @@ jobs:
           mv .pio/build/${{ matrix.target.name }}/firmware_0x00.bin .pio/build/${{ env.build_name }}_0x00.bin
 
       - name: Create Artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ${{ env.build_name }}.bin
           path: .pio/build/${{ env.build_name }}.bin
 
       - name: Create Artifact Merged 
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: ${{ matrix.target.merge == true }}
         with:
           name: "${{ env.build_name }}_0x00.bin"