fix: deb installation error

[x7c1]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• New Binding Issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

it will fix the installation error occured by this steps:

# /your/path/to/tauri/examples/helloworld
$ cargo tauri build
...
    Bundling helloworld_0.1.0_amd64.deb
    Bundling helloworld_0.1.0_amd64.AppImage
    Finished 2 bundles at:
        /your/path/to/tauri/target/release/bundle/deb/helloworld_0.1.0_amd64.deb
        /your/path/to/tauri/target/release/bundle/appimage/helloworld_0.1.0_amd64.AppImage

$ sudo apt-get install ../../target/release/bundle/deb/helloworld_0.1.0_amd64.deb
[sudo] password for <you>: 
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'helloworld' instead of '../../target/release/bundle/deb/helloworld_0.1.0_amd64.deb'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 helloworld : Depends: libwebkit2gtk-4.0 but it is not installable
E: Unable to correct problems, you have held broken packages.

[lucasfernog]

Thanks :)