Update version branding to rc1 (#13736)

Author: mmitche

eng/Versions.props

@@ -5,8 +5,8 @@
     <MinorVersion>0</MinorVersion>
     <PatchVersion>0</PatchVersion>
     <!-- version in our package name #.#.#-below.#####.## -->
-    <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseVersionIteration>7</PreReleaseVersionIteration>
+    <PreReleaseVersionLabel>rc</PreReleaseVersionLabel>
+    <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>