synchronize preprocessor directives on NET8_0_OR_GREATER

Author: RenderMichael

dotnet/src/webdriver/DefaultFileDetector.cs

@@ -18,8 +18,6 @@
 
 #nullable enable
 
-using System.Diagnostics.CodeAnalysis;
-
 namespace OpenQA.Selenium
 {
     /// <summary>
@@ -35,8 +33,8 @@ public class DefaultFileDetector : IFileDetector
         /// <param name="keySequence">The sequence to test for file existence.</param>
         /// <returns>This method always returns <see langword="false"/> in this implementation.</returns>
         public bool IsFile(
-#if NET
-            [NotNullWhen(true)]
+#if NET8_0_OR_GREATER
+            [System.Diagnostics.CodeAnalysis.NotNullWhen(true)]
 #endif
         string? keySequence)
         {

dotnet/src/webdriver/Firefox/FirefoxDriver.cs

@@ -21,7 +21,6 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.IO;
 using System.IO.Compression;
@@ -249,8 +248,8 @@ public override IFileDetector FileDetector
         /// <summary>
         /// Gets a value indicating whether a DevTools session is active.
         /// </summary>
-#if NET
-        [MemberNotNullWhen(true, nameof(devToolsSession))]
+#if NET8_0_OR_GREATER
+        [System.Diagnostics.CodeAnalysis.MemberNotNullWhen(true, nameof(devToolsSession))]
 #endif
         public bool HasActiveDevToolsSession
         {

dotnet/src/webdriver/IFileDetector.cs

@@ -16,8 +16,6 @@
 // limitations under the License.
 // </copyright>
 
-using System.Diagnostics.CodeAnalysis;
-
 #nullable enable
 
 namespace OpenQA.Selenium
@@ -35,8 +33,8 @@ public interface IFileDetector
         /// <param name="keySequence">The sequence to test for file existence.</param>
         /// <returns><see langword="true"/> if the key sequence represents a file; otherwise, <see langword="false"/>.</returns>
         bool IsFile(
-#if NET
-            [NotNullWhen(true)]
+#if NET8_0_OR_GREATER
+            [System.Diagnostics.CodeAnalysis.NotNullWhen(true)]
 #endif
         string? keySequence);
     }

dotnet/src/webdriver/Remote/LocalFileDetector.cs

@@ -16,7 +16,6 @@
 // limitations under the License.
 // </copyright>
 
-using System.Diagnostics.CodeAnalysis;
 using System.IO;
 
 #nullable enable
@@ -36,8 +35,8 @@ public class LocalFileDetector : IFileDetector
         /// <param name="keySequence">The sequence to test for file existence.</param>
         /// <returns><see langword="true"/> if the key sequence represents a file; otherwise, <see langword="false"/>.</returns>
         public bool IsFile(
-#if NET
-            [NotNullWhen(true)]
+#if NET8_0_OR_GREATER
+            [System.Diagnostics.CodeAnalysis.NotNullWhen(true)]
 #endif
         string? keySequence)
         {