Somehow we ended up with two conflicting versions listed for C#, so this commit removes the incorrect one (the correct one is 3.13.0-rc3).
@@ -5,7 +5,6 @@
<Copyright>Copyright 2015, Google Inc.</Copyright>
<AssemblyTitle>Google Protocol Buffers</AssemblyTitle>
<VersionPrefix>3.13.0-rc3</VersionPrefix>
- <VersionPrefix>3.12.3</VersionPrefix>
<!-- C# 7.2 is required for Span/BufferWriter/ReadOnlySequence -->
<LangVersion>7.2</LangVersion>
<Authors>Google Inc.</Authors>