std.tar: fix build on 32 bit platform

Fixing error from ci:

std/tar.zig:423:54: error: expected type 'usize', found 'u64'
std/tar.zig:423:54: note: unsigned 32-bit int cannot represent all possible unsigned 64-bit values
67336ca8c6Igor Anić committed on 3/11/2024, 11:24:11 AMparentf5fd469
1 file changedLine totals unavailable