Change package_name allocation method to dupeSentinel

[cers000]

更新zig0.16新的api，dupeZ已弃用

[silbinarywolf]

Please change to:

if (builtin.zig_version.major == 0 and builtin.zig_version.minor <= 15)
   // Deprecated: Older Zig version compatibility
   try b.allocator.dupeZ(...)
else
   try b.allocator.dupeSentinel(...)

[cers000]

好吧是我搞错了，zig0.16只是弃用dupeZ，并没有从标准库中删除dupeZ，0.17版本才正式删除了dupeZ，改用dupeSentinel，我用的版本是0.17.0-dev.356，那这里没必要更改

[silbinarywolf]

@cers000 Im happy to support 0.17.x+, Use the change I suggested above so it’s also backwards compatible with Zig 0.15.0 and Zig 0.16.0