Bump version to 7.0.6

Author: roji

Directory.Build.props

@@ -13,7 +13,7 @@
 
     <Copyright>Copyright 2023 © The Npgsql Development Team</Copyright>
     <Company>Npgsql</Company>
-    <VersionPrefix>7.0.4</VersionPrefix>
+    <VersionPrefix>7.0.6</VersionPrefix>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <PackageLicenseExpression>PostgreSQL</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/npgsql/efcore.pg</PackageProjectUrl>