feat:升级linq2db到5.4.1版，解决postgress不能使用的问题，并升级postgress sdk和sqlclient sdk到最新版，测试通过

Author: Jovi

Packages.props

@@ -32,7 +32,7 @@
     <PackageReference Update="Confluent.Kafka" Version="2.6.0" />
     <PackageReference Update="RabbitMQ.Client" Version="6.8.1" />
     <PackageReference Update="System.Reactive" Version="6.0.1" />
-    <PackageReference Update="linq2db" Version="4.1.1" />
+    <PackageReference Update="linq2db" Version="5.4.1" />
     <PackageReference Update="IdGen" Version="3.0.7" />
 
     <PackageReference Update="Lindhart.Analyser.MissingAwaitWarning" Version="2.0.0" PrivateAssets="All" />

examples/Packages.props

@@ -5,7 +5,7 @@
    <PackageReference Update="Microsoft.Extensions.Hosting" Version="8.0.1" />
    <PackageReference Update="Microsoft.Extensions.Logging.Console" Version="8.0.0" />
    <PackageReference Update="MySqlConnector" Version="2.2.0" />
-   <PackageReference Update="Npgsql" Version="7.0.0" />
-   <PackageReference Update="Microsoft.Data.SqlClient" Version="5.0.0" />
+   <PackageReference Update="Npgsql" Version="9.0.3" />
+   <PackageReference Update="Microsoft.Data.SqlClient" Version="6.0.1" />
  </ItemGroup>
 </Project>

src/Storage/Vertex.Storage.Linq2db/Db/EventDb.cs

@@ -1,5 +1,7 @@
 using LinqToDB;
 using LinqToDB.Data;
+using LinqToDB.Mapping;
+
 using Vertex.Storage.Linq2db.Entities;
 
 namespace Vertex.Storage.Linq2db.Db
@@ -9,7 +11,7 @@ public class EventDb : DataConnection
         public EventDb(string name)
             : base(name)
         {
-            this.MappingSchema.EntityDescriptorCreatedCallback = (schema, entityDescriptor) =>
+            MappingSchema.EntityDescriptorCreatedCallback = (schema, entityDescriptor) =>
             {
                 entityDescriptor.TableName = entityDescriptor.TableName.ToLower();
                 foreach (var entityDescriptorColumn in entityDescriptor.Columns)

src/Storage/Vertex.Storage.Linq2db/Db/SnapshotDb.cs

@@ -1,5 +1,7 @@
 using LinqToDB;
 using LinqToDB.Data;
+using LinqToDB.Mapping;
+
 using Vertex.Storage.Linq2db.Entities;
 
 namespace Vertex.Storage.Linq2db.Db
@@ -9,7 +11,7 @@ public class SnapshotDb : DataConnection
         public SnapshotDb(string name)
             : base(name)
         {
-            this.MappingSchema.EntityDescriptorCreatedCallback = (schema, entityDescriptor) =>
+            MappingSchema.EntityDescriptorCreatedCallback = (schema, entityDescriptor) =>
             {
                 entityDescriptor.TableName = entityDescriptor.TableName.ToLower();
                 foreach (var entityDescriptorColumn in entityDescriptor.Columns)

src/Storage/Vertex.Storage.Linq2db/Db/SubSnapshotDb.cs

@@ -1,5 +1,7 @@
 using LinqToDB;
 using LinqToDB.Data;
+using LinqToDB.Mapping;
+
 using Vertex.Storage.Linq2db.Entities;
 
 namespace Vertex.Storage.Linq2db.Db
@@ -9,7 +11,7 @@ public class SubSnapshotDb : DataConnection
         public SubSnapshotDb(string name)
             : base(name)
         {
-            this.MappingSchema.EntityDescriptorCreatedCallback = (schema, entityDescriptor) =>
+            MappingSchema.EntityDescriptorCreatedCallback = (schema, entityDescriptor) =>
             {
                 entityDescriptor.TableName = entityDescriptor.TableName.ToLower();
                 foreach (var entityDescriptorColumn in entityDescriptor.Columns)