mongo几个库改成dotnet core 2.2，之前漏改了

Server/ThirdParty/MongoDBDriver/MongoDB.Bson/MongoDB.Bson.csproj

@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <LangVersion>6</LangVersion>
+    <LangVersion>7.3</LangVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />
     <CodeAnalysisRuleSet>../MongoDBLegacy.ruleset</CodeAnalysisRuleSet>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup>

Server/ThirdParty/MongoDBDriver/MongoDB.Driver.Core/MongoDB.Driver.Core.csproj

@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <LangVersion>6</LangVersion>
+    <LangVersion>7.3</LangVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />
     <CodeAnalysisRuleSet>../MongoDB.ruleset</CodeAnalysisRuleSet>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup>

Server/ThirdParty/MongoDBDriver/MongoDB.Driver.GridFS/MongoDB.Driver.GridFS.csproj

@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <LangVersion>6</LangVersion>
+    <LangVersion>7.3</LangVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />
     <CodeAnalysisRuleSet>../MongoDB.ruleset</CodeAnalysisRuleSet>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup>

Server/ThirdParty/MongoDBDriver/MongoDB.Driver/MongoDB.Driver.csproj

@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <LangVersion>6</LangVersion>
+    <LangVersion>7.3</LangVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />
     <CodeAnalysisRuleSet>../MongoDB.ruleset</CodeAnalysisRuleSet>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup>