Added Plex Media Server version 1.21.0.3711 (#5191)

manifests/Plex/PlexMediaServer/1.21.0.3711.yaml

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+# ================== General ==================
+Id: Plex.PlexMediaServer
+Publisher: Plex
+Name: Plex Media Server
+Author: Plex
+Description: Host media content in Plex Media Server.
+AppMoniker: plexmediaserver
+Tags: mediaserver, streaming, video, music
+
+# ================== License ==================
+Homepage: https://www.plex.tv/media-server-downloads/
+License: Copyright © 2020, Plex
+LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
+
+# ================= Installer =================
+MinOSVersion: 10.0.0.0
+#Channel: stable                # Channel is not supported in this preview (5/24/2020)
+Version: 1.21.0.3711
+
+
+InstallerType: nullsoft
+Installers:
+  - Arch: x86
+    Url: https://downloads.plex.tv/plex-media-server-new/1.21.0.3711-b509cc236/windows/PlexMediaServer-1.21.0.3711-b509cc236-x86.exe
+    Sha256: A53AE86B3C71A4976AFC8F20D6B48B5DFC6D5BFF1E4D2E39B364D8D178AF29BD
+    ProductCode: "{40c376bf-c3a0-439b-8353-f69a3bac10d6}"
+    Scope: machine
+    Language: en-US
+    
+# ManifestVersion: 0.1.0