Update Rustlang.rust-msvc to 1.50.0 (#7803)

manifests/Rustlang/rust-msvc/1.50.0.yaml

@@ -0,0 +1,18 @@
+Id: Rustlang.rust-msvc
+Version: 1.50.0
+Name: rust-msvc
+Publisher: Rustlang
+License: Apache 2.0 and MIT
+LicenseUrl: https://raw.githubusercontent.com/rust-lang/rust/master/COPYRIGHT
+AppMoniker: rust-msvc
+Tags: rust, windows, msvc
+Description: this is the rust-lang built with msvc
+Homepage: https://www.rust-lang.org/
+Installers:
+  - Arch: x64
+    Url: https://static.rust-lang.org/dist/rust-1.50.0-x86_64-pc-windows-msvc.msi
+    Sha256: c38eb865683b9fcdd12ba0cb9a3dba746694b0e00083739080381cc909aee5fe
+    InstallerType: msi
+    Switches:
+      Silent: "/quiet"
+      SilentWithProgress: "/quiet /passive"