Update sia.sia-ui to 1.5.6 (#13738)

manifests/s/sia/sia-ui/1.5.6/sia.sia-ui.yaml

@@ -0,0 +1,20 @@
+PackageIdentifier: sia.sia-ui
+PackageName: sia UI
+Publisher: sia
+Author: sia
+ShortDescription: Sia UI is an Electron app that provides a user interface for common wallet, file-renting, and file-hosting features on Sia.
+Tags:
+- electron
+- sia
+PackageUrl: https://sia.tech/get-started
+License: MIT
+LicenseUrl: https://gitlab.com/NebulousLabs/Sia-UI/-/blob/master/LICENSE
+PackageVersion: 1.5.6
+InstallerType: nullsoft
+Installers:
+- Architecture: x64
+  InstallerUrl: https://sia.tech/releases/Sia-UI-v1.5.6.exe
+  InstallerSha256: c58a7f3e96115941b27aa1ec33b120ef22547ba3d1e230a982a6429d7a23f47a
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0