Fix: NotSameFileSystem at clonefile (#546)

Fixes issue #531

Before this, using 'bun install' on a directory in different filesystem
such as tmpfs (/tmp) would have caused "Error: NotSameFileSystem".

This commit fixes that by handling this error, and at end of function it
will fall back to use copyfile (same as --backend=copyfile)

src/install/install.zig

@@ -1061,7 +1061,7 @@ const PackageInstall = struct {
                         return result;
                     } else |err| {
                         switch (err) {
-                            error.NotSupported => {
+                            error.NotSameFileSystem, error.NotSupported => {
                                 supported_method = .copyfile;
                             },
                             error.FileNotFound => return Result{