Reverted the Windows installer download links to 12.0.4 since the 12.0.6...

Reverted the Windows installer download links to 12.0.4 since the 12.0.6 installer is not code-signed

update_1/release/download-windows-x86_64.json

-{"binary":"https://cdn.mullvad.net/browser/12.0.6/mullvadbrowser-install-win64-12.0.6_ALL.exe","git_tag":"tbb-12.0.6-build1","sig":"https://cdn.mullvad.net/browser/12.0.6/mullvadbrowser-install-win64-12.0.6_ALL.exe.asc","version":"12.0.6"}
\ No newline at end of file
+{"binary":"https://cdn.mullvad.net/browser/12.0.4/mullvadbrowser-install-win64-12.0.4_ALL.exe","git_tag":"mb-12.0.4-build1","sig":"https://cdn.mullvad.net/browser/12.0.4/mullvadbrowser-install-win64-12.0.4_ALL.exe.asc","version":"12.0.4"}
\ No newline at end of file

update_1/release/downloads.json

-{"downloads":{"linux64":{"ALL":{"binary":"https://cdn.mullvad.net/browser/12.0.6/mullvad-browser-linux64-12.0.6_ALL.tar.xz","sig":"https://cdn.mullvad.net/browser/12.0.6/mullvad-browser-linux64-12.0.6_ALL.tar.xz.asc"}},"macos":{"ALL":{"binary":"https://cdn.mullvad.net/browser/12.0.6/MullvadBrowser-12.0.6-macos_ALL.dmg","sig":"https://cdn.mullvad.net/browser/12.0.6/MullvadBrowser-12.0.6-macos_ALL.dmg.asc"}},"win64":{"ALL":{"binary":"https://cdn.mullvad.net/browser/12.0.6/mullvadbrowser-install-win64-12.0.6_ALL.exe","sig":"https://cdn.mullvad.net/browser/12.0.6/mullvadbrowser-install-win64-12.0.6_ALL.exe.asc"}}},"tag":"tbb-12.0.6-build1","version":"12.0.6"}
\ No newline at end of file
+{"downloads":{"linux64":{"ALL":{"binary":"https://cdn.mullvad.net/browser/12.0.6/mullvad-browser-linux64-12.0.6_ALL.tar.xz","sig":"https://cdn.mullvad.net/browser/12.0.6/mullvad-browser-linux64-12.0.6_ALL.tar.xz.asc"}},"macos":{"ALL":{"binary":"https://cdn.mullvad.net/browser/12.0.6/MullvadBrowser-12.0.6-macos_ALL.dmg","sig":"https://cdn.mullvad.net/browser/12.0.6/MullvadBrowser-12.0.6-macos_ALL.dmg.asc"}},"win64":{"ALL":{"binary":"https://cdn.mullvad.net/browser/12.0.4/mullvadbrowser-install-win64-12.0.4_ALL.exe","sig":"https://cdn.mullvad.net/browser/12.0.4/mullvadbrowser-install-win64-12.0.4_ALL.exe.asc"}}},"tag":"mb-12.0.6-build1","version":"12.0.4"}
\ No newline at end of file