POSIX::tmpnam is unimplemented

[eserte]

Newer perl versions (e.g.5.28.x) don't implement POSIX::tmpnam anymore:

Unimplemented: POSIX::tmpnam(): use File::Temp instead at /opt/perl-5.28.1/lib/5.28.1/x86_64-linux/POSIX.pm line 185.

#   Failed test 'require Respite::Server::Test;'
#   at t/00-load.t line 12.
#     Tried to require 'Respite::Server::Test'.
#     Error:  Unimplemented: POSIX::tmpnam() at /home/cpansand/.cpan/build/2018120422/Respite-0.2-0/blib/lib/Respite/Server/Test.pm line 6.
# BEGIN failed--compilation aborted at /home/cpansand/.cpan/build/2018120422/Respite-0.2-0/blib/lib/Respite/Server/Test.pm line 6.
# Compilation failed in require at (eval 40) line 2.
# Looks like you failed 1 test of 7.
t/00-load.t ................... 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/7 subtests 
...