Fix incorrect '#ifdef' checks

Author: Sergio0694

src/SQLite.cs

@@ -282,7 +282,7 @@ CreateTablesResult CreateTables<
 			where T3 : new()
 			where T4 : new()
 			where T5 : new();
-#if NET
+#if NET8_0_OR_GREATER
 		[RequiresUnreferencedCode ("This method requires 'DynamicallyAccessedMemberTypes.All' on each input 'Type' instance.")]
 #endif
 		CreateTablesResult CreateTables (CreateFlags createFlags = CreateFlags.None, params Type[] types);
@@ -1091,7 +1091,7 @@ public CreateTablesResult CreateTables<
 		/// <returns>
 		/// Whether the table was created or migrated for each type.
 		/// </returns>
-#if NET
+#if NET8_0_OR_GREATER
 		[RequiresUnreferencedCode("This method requires 'DynamicallyAccessedMemberTypes.All' on each input 'Type' instance.")]
 #endif
 		public CreateTablesResult CreateTables (CreateFlags createFlags = CreateFlags.None, params Type[] types)

src/SQLiteAsync.cs

@@ -141,7 +141,7 @@ Task<CreateTablesResult> CreateTablesAsync<
 			where T3 : new()
 			where T4 : new()
 			where T5 : new();
-#if NET
+#if NET8_0_OR_GREATER
 		[RequiresUnreferencedCode ("This method requires 'DynamicallyAccessedMemberTypes.All' on each input 'Type' instance.")]
 #endif
 		Task<CreateTablesResult> CreateTablesAsync (CreateFlags createFlags = CreateFlags.None, params Type[] types);
@@ -712,7 +712,7 @@ public Task<CreateTablesResult> CreateTablesAsync<
 		/// <returns>
 		/// Whether the table was created or migrated for each type.
 		/// </returns>
-#if NET
+#if NET8_0_OR_GREATER
 		[RequiresUnreferencedCode ("This method requires 'DynamicallyAccessedMemberTypes.All' on each input 'Type' instance.")]
 #endif
 		public Task<CreateTablesResult> CreateTablesAsync (CreateFlags createFlags = CreateFlags.None, params Type[] types)