Remove ProductLifecycle.Deperecated from deprecated list (#1462)

Author: reakaleek

src/Elastic.Markdown/Myst/FrontMatter/Applicability.cs

@@ -190,7 +190,7 @@ public static bool TryParse(string? value, IList<(Severity, string)> diagnostics
 		};
 
 		// TODO emit as error when all docs have been updated
-		if (lifecycle is ProductLifecycle.Planned or ProductLifecycle.Deprecated or ProductLifecycle.Development)
+		if (lifecycle is ProductLifecycle.Planned or ProductLifecycle.Development)
 			diagnostics.Add((Severity.Hint, $"The '{lookup}' lifecycle is deprecated and will be removed in a future release."));
 
 		var version = tokens.Length < 2