chore: update langversion to 14

Author: filzrev

build/common.props

@@ -41,7 +41,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsVisualBasic)' != 'true' AND '$(IsFsharp)' != 'true' ">
-    <LangVersion>12.0</LangVersion>
+    <LangVersion>14.0</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(VersionPrefix)' == '' ">

src/BenchmarkDotNet/Code/DeclarationsProvider.cs

@@ -86,15 +86,15 @@ internal class NonVoidDeclarationsProvider : DeclarationsProvider
         public NonVoidDeclarationsProvider(Descriptor descriptor) : base(descriptor) { }
 
         public override string ConsumeField
-            => !Consumer.IsConsumable(WorkloadMethodReturnType) && Consumer.HasConsumableField(WorkloadMethodReturnType, out var field)
-                ? $".{field.Name}"
+            => !Consumer.IsConsumable(WorkloadMethodReturnType) && Consumer.HasConsumableField(WorkloadMethodReturnType, out var fieldInfo)
+                ? $".{fieldInfo.Name}"
                 : null;
 
         protected override Type OverheadMethodReturnType
             => Consumer.IsConsumable(WorkloadMethodReturnType)
                 ? WorkloadMethodReturnType
-                : (Consumer.HasConsumableField(WorkloadMethodReturnType, out var field)
-                    ? field.FieldType
+                : (Consumer.HasConsumableField(WorkloadMethodReturnType, out var fieldInfo)
+                    ? fieldInfo.FieldType
                     : typeof(int)); // we return this simple type because creating bigger ValueType could take longer than benchmarked method itself
 
         public override string OverheadImplementation