chore: re-release Theme Expansion as v1.2.3

Hab vergessen die repo.json wieder mit zu bumpen, deshalb hat
Dalamud den v1.2.2-Release nicht angenommen — komplette Manifest-
Bump-Checkliste diesmal durchgezogen: csproj, yaml-Description +
Changelog, repo.json (AssemblyVersion + TestingAssemblyVersion +
drei DownloadLink*-URLs + Description + Changelog), CHANGELOG.md,
ROADMAP.md, README.md, Forge-Post-Datei. Inhalt unverändert
gegenüber v1.2.2.

HellionChat/HellionChat.csproj

@@ -4,7 +4,7 @@
              0.1.0 is our bootstrap release; the underlying Chat 2 base is
              called out in the yaml changelog so users can see what it
              derives from. -->
-        <Version>1.2.2</Version>
+        <Version>1.2.3</Version>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <!-- Honor packages.lock.json on restore so floating version ranges