Limit search pattern and directory recursion

Narrow the scope of the search pattern to only include project files and
limit directory recursion to 255 subdirectories to avoid infinite loops
and subsequent `PathTooLongException`. May fix GH-4411.

Author: asbjornu

src/GitVersion.Output/AssemblyInfo/ProjectFileUpdater.cs

@@ -190,11 +190,18 @@ private IEnumerable<IFileInfo> GetProjectFiles(AssemblyInfoContext context)
         }
         else
         {
-            foreach (var item in fileSystem.Directory.EnumerateFiles(workingDirectory, "*", SearchOption.AllDirectories).Where(IsSupportedProjectFile))
+            var options = new EnumerationOptions
             {
-                var assemblyInfoFile = fileSystem.FileInfo.New(item);
-
-                yield return assemblyInfoFile;
+                RecurseSubdirectories = true,
+                MaxRecursionDepth = 255
+            };
+            var projectFiles = fileSystem.Directory
+                .EnumerateFiles(workingDirectory, "*proj", options)
+                .Where(IsSupportedProjectFile);
+
+            foreach (var projectFile in projectFiles)
+            {
+                yield return fileSystem.FileInfo.New(projectFile);
             }
         }
     }