Fix warnings in YAMLLinter module (#17863)

Content.YAMLLinter/Program.cs

@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Content.IntegrationTests;
-using Content.Shared.CCVar;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.Markdown.Validation;
 using Robust.Shared.Timing;
@@ -13,7 +12,7 @@ namespace Content.YAMLLinter
 {
     internal static class Program
     {
-        private static async Task<int> Main(string[] args)
+        private static async Task<int> Main(string[] _)
         {
             var stopwatch = new Stopwatch();
             stopwatch.Start();