Cut 9.0.0-rc.1

First release candidate for Marten 9.0. Consumes the lifted JasperFx 2.0.0-rc.2
and Weasel 9.0.0-alpha.8 dedupe types (Critter Stack 2026 pillar, #214);
all pinned prerelease dependencies are published on nuget.org.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jeremydmiller

Directory.Build.props

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project>
     <PropertyGroup>
-        <Version>9.0.0-alpha.5</Version>
+        <Version>9.0.0-rc.1</Version>
         <LangVersion>13.0</LangVersion>
         <Authors>Jeremy D. Miller;Babu Annamalai;Jaedyn Tonee</Authors>
         <PackageIconUrl>https://martendb.io/logo.png</PackageIconUrl>