Add Osu! 2021.407.1 (#10279)

* Add Osu! 2021.407.1

* Add Osu! 2021.407.1

manifests/p/Peppy/Osu!/2021.407.1/Peppy.Osu!.yaml

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+PackageIdentifier: Peppy.Osu!
+PackageName: Osu!
+Publisher: Dean "peppy" Herbert
+Moniker: osu
+ShortDescription: 'A free-to-win rhythm game developed by peppy with four game modes: osu!standard, a circle clicking simulator; osu!taiko, a drumming emulator; osu!catch, a fruit salad catcher; and osu!mania, a key smashing synthesizer.'
+PackageUrl: https://osu.ppy.sh/
+PackageVersion: 2021.407.1
+License: MIT
+LicenseUrl: https://github.com/ppy/osu/blob/master/LICENCE
+Installers:
+- Architecture: x64
+  InstallerUrl: https://github.com/ppy/osu/releases/download/2021.407.1/install.exe
+  InstallerSha256: 46b937573fc921169e38dd0b98e96ea45d94f797fe1b592fb01afccbf20e638e
+  InstallerType: exe
+  InstallerSwitches:
+    Silent: /silent
+    SilentWithProgress: /silent
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0