chore: CA1816 Call GC.SuppressFinalize correctly

[CA1816: Call GC.SuppressFinalize correctly](https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1816)

Related to #340

.editorconfig

@@ -770,10 +770,6 @@ dotnet_diagnostic.CA1813.severity = suggestion
 # CA1815: Override equals and operator equals on value types
 dotnet_diagnostic.CA1815.severity = suggestion
 
-# https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1816
-# CA1816: Call GC.SuppressFinalize correctly
-dotnet_diagnostic.CA1816.severity = suggestion
-
 # https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1819
 # CA1819: Properties should not return arrays
 dotnet_diagnostic.CA1819.severity = suggestion

src/Microsoft.Sbom.Api/Output/Telemetry/TimingRecorder.cs

@@ -10,7 +10,7 @@ namespace Microsoft.Sbom.Api.Output.Telemetry;
 /// <summary>
 /// Records the elapsed time for a given event.
 /// </summary>
-public class TimingRecorder : IDisposable
+public sealed class TimingRecorder : IDisposable
 {
     private readonly string eventName;
     private readonly Stopwatch stopWatch;