Add Base prefix to list_deletefirst! (#50852)

I noticed this when debugging a bizarre issue, probably caused by some
earlier undefined behaviour, and I haven't been able to come up with
simple reproduction steps. It seems like `current_task().queue` is
basically never set after `wait()`. Based on
#32903 it seems like raising
SIGINT at the right time might trigger this.

In any case, if you manage to trigger it, `list_deletefirst!` will fail
because it is out of scope. I double-checked this using `@eval Sockets
list_deletefirst!` with Julia 1.9.2 (and there's only been one change to
`Sockets` since then).

stdlib/Sockets/src/Sockets.jl

@@ -450,7 +450,7 @@ function send(sock::UDPSocket, ipaddr::IPAddr, port::Integer, msg)
  finally
  Base.sigatomic_end()
  iolock_begin()
- ct.queue === nothing || list_deletefirst!(ct.queue, ct)
+ ct.queue === nothing || Base.list_deletefirst!(ct.queue, ct)
  if uv_req_data(uvw) != C_NULL
  # uvw is still alive,
  # so make sure we won't get spurious notifications later

stdlib/Sockets/src/addrinfo.jl

@@ -90,7 +90,7 @@ function getalladdrinfo(host::String)
  finally
  Base.sigatomic_end()
  iolock_begin()
- ct.queue === nothing || list_deletefirst!(ct.queue, ct)
+ ct.queue === nothing || Base.list_deletefirst!(ct.queue, ct)
  if uv_req_data(req) != C_NULL
  # req is still alive,
  # so make sure we don't get spurious notifications later
@@ -205,7 +205,7 @@ function getnameinfo(address::Union{IPv4, IPv6})
  finally
  Base.sigatomic_end()
  iolock_begin()
- ct.queue === nothing || list_deletefirst!(ct.queue, ct)
+ ct.queue === nothing || Base.list_deletefirst!(ct.queue, ct)
  if uv_req_data(req) != C_NULL
  # req is still alive,
  # so make sure we don't get spurious notifications later