fixed a mistake in test definition

Author: tkstanczak

src/Nethermind/Ethereum.Difficulty.Test/DifficultyFrontierTests.cs

@@ -35,7 +35,7 @@ public static IEnumerable<DifficultyTests> LoadFrontierTests()
         [TestCaseSource(nameof(LoadFrontierTests))]
         public void Test(DifficultyTests test)
         {
-            RunTest(test, new SingleReleaseSpecProvider(Berlin.Instance, 1));
+            RunTest(test, new SingleReleaseSpecProvider(Frontier.Instance, 1));
         }    
     }
 }

src/Nethermind/Nethermind.Core/Version.cs

@@ -37,7 +37,7 @@ static ClientVersion()
             string gitHash = File.Exists("git-hash") ? File.ReadAllText("git-hash") : string.Empty;
             gitHash = Regex.Match(gitHash, "\\-g(\\w+)").Groups[1].Value;
 
-            Description = $"Nethermind/v1.2.1-{gitHash}/{RuntimeInformation.OSArchitecture}-{osDescription}/{RuntimeInformation.FrameworkDescription.Trim().Replace(".NET ", "").Replace(" ", "")}";
+            Description = $"Nethermind/v1.2.2-{gitHash}/{RuntimeInformation.OSArchitecture}-{osDescription}/{RuntimeInformation.FrameworkDescription.Trim().Replace(".NET ", "").Replace(" ", "")}";
         }
 
         public static string Description { get; }