pin gzip dependency (#87)

- later versions have compile issues: https://github.com/1024jp/GzipSwift/issues/65

fixes: https://github.com/ml-explore/mlx-swift-examples/issues/85

mlx-swift-examples.xcodeproj/project.pbxproj

@@ -2591,8 +2591,8 @@
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/1024jp/GzipSwift";
 			requirement = {
-				kind = upToNextMajorVersion;
-				minimumVersion = 6.0.1;
+				kind = exactVersion;
+				version = 6.0.1;
 			};
 		};
 		C382DE882B630889000F8F03 /* XCRemoteSwiftPackageReference "swift-async-algorithms" */ = {