Fix Error with Uppercase Characters in Version Strings

Resolve an issue where versions with uppercase characters (e.g.,
1.0.0-Beta, 1.0.0.BETA.1) caused CycloneDX to throw errors. The
problem occurred because the NuGet cache converted version strings
to lowercase for path names.

Signed-off-by: John Hunhoff <[email protected]>

CycloneDX/Services/NugetV3Service.cs

@@ -80,11 +80,12 @@ internal string GetCachedNuspecFilename(string name, string version)
             if (string.IsNullOrEmpty(name) || string.IsNullOrEmpty(version)) { return null; }
 
             var lowerName = name.ToLowerInvariant();
+            var lowerVersion = version.ToLowerInvariant();
             string nuspecFilename = null;
 
             foreach (var packageCachePath in _packageCachePaths)
             {
-                var currentDirectory = _fileSystem.Path.Combine(packageCachePath, lowerName, NormalizeVersion(version));
+                var currentDirectory = _fileSystem.Path.Combine(packageCachePath, lowerName, NormalizeVersion(lowerVersion));
                 var currentFilename = _fileSystem.Path.Combine(currentDirectory, lowerName + _nuspecExtension);
                 if (_fileSystem.File.Exists(currentFilename))
                 {