Update 16.3 pre-release label to beta4

Author: JoeRobich

eng/Versions.props

@@ -8,7 +8,7 @@
     <MajorVersion>3</MajorVersion>
     <MinorVersion>3</MinorVersion>
     <PatchVersion>1</PatchVersion>
-    <PreReleaseVersionLabel>beta3</PreReleaseVersionLabel>
+    <PreReleaseVersionLabel>beta4</PreReleaseVersionLabel>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <SemanticVersioningV1>true</SemanticVersioningV1>
     <!--