@capacitor/filesystem downloadFile does not set execute permission

## Bug Report

### Plugin(s)
@capacitor/filesystem 6.0.1

### Capacitor Version

```
Capacitor Doctor

Latest Dependencies:

@capacitor/cli: 6.1.2
@capacitor/core: 6.1.2
@capacitor/android: 6.1.2
@capacitor/ios: 6.1.2

Installed Dependencies:

@capacitor/ios: not installed
@capacitor/cli: 6.1.2
@capacitor/android: 6.1.2
@capacitor/core: 6.1.2

[success] Android looking great! 👌
```

### Platform(s)
Android 13

### Current Behavior
execute permission not set
-rw-rw---- 1 u0_a153 media_rw 103608940 2024-10-17 15:33 filename.apk

### Expected Behavior
set the execute permission
-rwxrwx--- 1 u0_a153 media_rw 103608940 2024-10-17 16:33 filename.apk

### Code Reproduction
Just use the downloadFile method and try to download an apk file