chore: Update FsCodec to 3.0.0-rc.15

Author: bartelink

samples/Store/Domain/Domain.fsproj

@@ -18,8 +18,8 @@
   <ItemGroup>
     <PackageReference Include="FSharp.Core" Version="6.0.7" ExcludeAssets="contentfiles" />
 
-    <PackageReference Include="FsCodec.NewtonsoftJson" Version="3.0.0-rc.14.1" />
-    <PackageReference Include="FsCodec.SystemTextJson" Version="3.0.0-rc.14.1" />
+    <PackageReference Include="FsCodec.NewtonsoftJson" Version="3.0.0-rc.15" />
+    <PackageReference Include="FsCodec.SystemTextJson" Version="3.0.0-rc.15" />
 
     <ProjectReference Include="..\..\..\src\Equinox\Equinox.fsproj" />
   </ItemGroup>

samples/Tutorial/Tutorial.fsproj

@@ -28,7 +28,7 @@
 
   <ItemGroup>
     <PackageReference Include="MinVer" Version="4.2.0" PrivateAssets="All" />
-    <PackageReference Include="FsCodec.SystemTextJson" Version="3.0.0-rc.14.1" />
+    <PackageReference Include="FsCodec.SystemTextJson" Version="3.0.0-rc.15" />
     <PackageReference Include="Serilog.Sinks.Console" Version="4.1.0" />
     <PackageReference Include="Serilog.Sinks.Seq" Version="5.2.0" />
   </ItemGroup>

src/Equinox/Equinox.fsproj

@@ -24,7 +24,7 @@
     <!-- Also avoids Rider search finding stuff in FSharp.Core.xml -->
     <PackageReference Include="FSharp.Core" Version="6.0.7"><ExcludeAssets>contentfiles</ExcludeAssets></PackageReference>
 
-    <PackageReference Include="FsCodec" Version="3.0.0-rc.14.1" />
+    <PackageReference Include="FsCodec" Version="3.0.0-rc.15" />
     <PackageReference Include="Serilog" Version="2.12.0" />
     <PackageReference Include="System.Runtime.Caching" Version="6.0.0" />