Upgrade System.Memory

Author: paulirwin

src/F23.StringSimilarity/F23.StringSimilarity.csproj

@@ -20,7 +20,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
-    <PackageReference Include="System.Memory" Version="4.5.4" />
+    <PackageReference Include="System.Memory" Version="4.6.3" />
   </ItemGroup>
   <ItemGroup>
     <None Include="logo.png" Pack="true" PackagePath="\" />