Update version branding to rc1 (#118002)

Author: mmitche

eng/Versions.props

@@ -11,8 +11,8 @@
     <PackageVersionNet8>8.0.$([MSBuild]::Add($([System.Version]::Parse('$(PackageVersionNet9)').Build),11))</PackageVersionNet8>
     <PackageVersionNet7>7.0.20</PackageVersionNet7>
     <PackageVersionNet6>6.0.36</PackageVersionNet6>
-    <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseVersionIteration>7</PreReleaseVersionIteration>
+    <PreReleaseVersionLabel>rc</PreReleaseVersionLabel>
+    <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <!-- Enable to remove prerelease label. -->
     <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>