Fix year issue

[uudashr]

Found this while running some http request

Error executing vim.schedule lua callback: ...eem/.local/share/nvim/lazy/nvim-nio/lua/nio/tasks.lua:100: Async task failed without callback: The coroutine failed with this message: 
....local/share/nvim/lazy/rest.nvim/lua/rest-nvim/utils.lua:105: attempt to perform arithmetic on a nil value
stack traceback:
	....local/share/nvim/lazy/rest.nvim/lua/rest-nvim/utils.lua: in function 'parse_http_time'
	...l/share/nvim/lazy/rest.nvim/lua/rest-nvim/cookie_jar.lua:81: in function 'f'
	...Cellar/neovim/0.11.4/share/nvim/runtime/lua/vim/iter.lua:335: in function 'map'
	...l/share/nvim/lazy/rest.nvim/lua/rest-nvim/cookie_jar.lua:134: in function 'update_jar'
	...ocal/share/nvim/lazy/rest.nvim/lua/rest-nvim/request.lua:89: in function 'run_request'
	...ocal/share/nvim/lazy/rest.nvim/lua/rest-nvim/request.lua:120: in function <...ocal/share/nvim/lazy/rest.nvim/lua/rest-nvim/request.lua:109>
stack traceback:
	[C]: in function 'error'
	...eem/.local/share/nvim/lazy/nvim-nio/lua/nio/tasks.lua:100: in function 'close_task'
	...eem/.local/share/nvim/lazy/nvim-nio/lua/nio/tasks.lua:122: in function 'cb'
	...eem/.local/share/nvim/lazy/nvim-nio/lua/nio/tasks.lua:183: in function 'waiter'
	...m/.local/share/nvim/lazy/nvim-nio/lua/nio/control.lua:116: in function 'wake'
	...m/.local/share/nvim/lazy/nvim-nio/lua/nio/control.lua:129: in function 'set'
	...re/nvim/lazy/rest.nvim/lua/rest-nvim/client/curl/cli.lua:382: in function <...re/nvim/lazy/rest.nvim/lua/rest-nvim/client/curl/cli.lua:376>

Seems that server give this back on the Cookie Tue, 07-Oct-25 10:40:55 GMT. Looks like it's an old format from RFC 850. So that hopefully this to handle the old server behavior without breaking the existing logic.

[boltlessengineer]

Thank you for your contribution! I'll merge this when I'm back home. GH mobile is pretty lacking for my workflow.