Make working directory name the same on all OS

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/SourceGenerators/DotnetSourceGeneratorWrapper/DotnetSourceGeneratorWrapper.cs

@@ -37,7 +37,8 @@ public IEnumerable<string> RunSourceGenerator(IEnumerable<string> additionalFile
         {
             try
             {
-                var relativePathToCsProj = Path.GetRelativePath(sourceDir, csprojFile);
+                var relativePathToCsProj = Path.GetRelativePath(sourceDir, csprojFile)
+                    .Replace('\\', '/'); // Ensure we're generating the same hash regardless of the OS
                 var name = FileUtils.ComputeHash($"{relativePathToCsProj}\n{this.GetType().Name}");
                 using var tempDir = new TemporaryDirectory(Path.Join(FileUtils.GetTemporaryWorkingDirectory(out _), "source-generator"), "source generator temporary", logger);
                 var analyzerConfigPath = Path.Combine(tempDir.DirInfo.FullName, $"{name}.txt");