Upgrade all manifests to v1 manifest format

manifests/o/Opera/OperaGX/68.0.3618.197/Opera.OperaGX.yaml

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+PackageIdentifier: Opera.OperaGX
+Publisher: Opera
+PackageName: Opera GX
+Author: Opera
+ShortDescription: Opera GX is a special version of the Opera browser built specifically to complement gaming. The browser includes unique features to help you get the most out of both gaming and browsing.
+Moniker: opera
+Tags:
+- Browser
+- Chromium
+- Blink
+FileExtensions:
+- html
+- htm
+- url
+Protocols:
+- http
+- https
+PackageUrl: https://www.opera.com/gx
+License: © 1995-2020 Opera Norway - All rights reserved
+LicenseUrl: https://www.opera.com/eula/computers
+MinimumOSVersion: 10.0.0.0
+PackageVersion: 68.0.3618.197
+InstallerSwitches:
+  Custom: /allusers=1 /launchbrowser=0 /setdefaultbrowser=0 /enable-installer-stats=0 /enable-stats=0
+  Silent: /silent
+  SilentWithProgress: /runimmediately
+InstallerType: exe
+Installers:
+- Architecture: x64
+  InstallerUrl: https://get.geo.opera.com/pub/opera_gx/68.0.3618.197/win/Opera_GX_68.0.3618.197_Setup_x64.exe
+  InstallerSha256: 55348cd26487085c976fc2422791d5984be924ac43b88e111f57b3533e671eaa
+  Scope: machine
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0