[msbuild] Dispose a few streams when done with them in the unzip/decompress logic. (#18410)

Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1829715.

msbuild/Xamarin.MacDev.Tasks/Decompress.cs

@@ -130,7 +130,7 @@ namespace Xamarin.MacDev {
 
 		static bool TryDecompressUsingUnzip (TaskLoggingHelper log, string zip, string resource, string decompressionDir)
 		{
-			var archive = ZipFile.OpenRead (zip);
+			using var archive = ZipFile.OpenRead (zip);
 			resource = resource.Replace ('\\', zipDirectorySeparator);
 			var entry = archive.GetEntry (resource);
 			if (entry is null) {
@@ -165,7 +165,7 @@ namespace Xamarin.MacDev {
 			resource = resource.Replace ('\\', zipDirectorySeparator);
 			var resourceAsDir = resource + zipDirectorySeparator;
 
-			var archive = ZipFile.OpenRead (zip);
+			using var archive = ZipFile.OpenRead (zip);
 			foreach (var entry in archive.Entries) {
 				var entryPath = entry.FullName;
 				if (entryPath.Length == 0)

msbuild/Xamarin.MacDev.Tasks/Tasks/ResolveNativeReferencesBase.cs

@@ -252,7 +252,7 @@ namespace Xamarin.MacDev.Tasks {
 		static bool TryGetInfoPlist (TaskLoggingHelper log, string resourcePath, string xcframework, [NotNullWhen (true)] out PDictionary? plist)
 		{
 			var manifestPath = Path.Combine (xcframework, "Info.plist");
-			var stream = CompressionHelper.TryGetPotentiallyCompressedFile (log, resourcePath, manifestPath);
+			using var stream = CompressionHelper.TryGetPotentiallyCompressedFile (log, resourcePath, manifestPath);
 			if (stream is null) {
 				plist = null;
 				return false;