Added Plex Media Server version 1.21.2.3943. (#6923)

manifests/Plex/PlexMediaServer/1.21.2.3943.yaml

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+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
+Homepage: https://www.plex.tv/media-server-downloads/
+License: Copyright © 2020, Plex
+LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
+MinOSVersion: 10.0.0.0
+#Channel: stable                # Channel is not supported in this preview (5/24/2020)
+Version: 1.21.2.3943
+
+InstallerType: nullsoft
+Installers:
+  - Arch: x86
+    Url: https://downloads.plex.tv/plex-media-server-new/1.21.2.3943-a91458577/windows/PlexMediaServer-1.21.2.3943-a91458577-x86.exe
+    Sha256: 0FBCF3B546E005E43EA177AF903ED596FDC6CECC5F202589328349219489F273
+    ProductCode: "{b1ee6cfb-b95f-4d46-a425-5ee3b487079a}"
+    Scope: machine
+    Language: en-US
+