Bump version to 5.5.0. (#260)

Author: teo-tsirpanis

sources/TileDB.CSharp/TileDB.CSharp.csproj

@@ -6,7 +6,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Nullable>enable</Nullable>
     <RootNamespace>TileDB.CSharp</RootNamespace>
-    <Version>5.4.0</Version>
+    <Version>5.5.0</Version>
     <Description>C# wrapper of the TileDB Embedded universal data engine.</Description>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>