docs(wiki-debian): update install instructions

[luisegarduno]

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Issue: a. Step 2 of Installation on Debian-based distributions returns a deprecation warning:

 wget -q https://wire-app.wire.com/linux/releases.key -O- | sudo apt-key add -

> Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8))

b. If the warning in step 2 is ignored, the user will see a similar warning when running step 4:

sudo apt-get update

> W: https://wire-app.wire.com/linux/debian/dists/stable/InRelease: Key is stored in legacy trusted gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details

Suggested fix:

Updating steps 2 & 3 in the Installation on Debian-based distributions section, with the following:

2. Import our PGP signing key to be able to verify the downloaded package

    sudo wget -q -O /usr/share/keyrings/wire-desktop.key https://wire-app.wire.com/linux/releases.key
   

3. Add our repository address to your sources list

    echo "deb [arch=amd64 signed-by=/usr/share/keyrings/wire-desktop.key] https://wire-app.wire.com/linux/debian stable main" \
      | sudo tee /etc/apt/sources.list.d/wire-desktop.list
   

Originally posted here: https://github.com/wireapp/wire-desktop/issues/8309#issuecomment-2602752821

[ChillerDragon]

Thanks, I tested this on debian 12 and it works wonderfully.