[release/8.0.4xx] Update branding to 8.0.421 (#20830)

Author: DonnaChen888

eng/Versions.props

@@ -8,7 +8,7 @@
     <VersionMajor>8</VersionMajor>
     <VersionMinor>0</VersionMinor>
     <VersionSDKMinor>4</VersionSDKMinor>
-    <VersionFeature>20</VersionFeature>
+    <VersionFeature>21</VersionFeature>
     <VersionPrefix>$(VersionMajor).$(VersionMinor).$(VersionSDKMinor)$(VersionFeature)</VersionPrefix>
     <MajorMinorVersion>$(VersionMajor).$(VersionMinor)</MajorMinorVersion>
     <CliProductBandVersion>$(MajorMinorVersion).$(VersionSDKMinor)</CliProductBandVersion>