Add missing authors field required by cargo deb. #778

Job	Run time
default_tests_with_upgrades / prepare	1s
docker_no_secrets / prepare	1s
default_tests / prepare	1s
full / prepare	1s
minimal / prepare	1s
no_cross / prepare	1s
no_docker / prepare	1s
no_test_scripts / prepare	1s
no_tests / prepare	1s
only_docker / prepare	1s
test_with_alt_pkg / prepare	1s
test_with_cargo_workspace / prepare	1s
test_with_obsolete_pkg_replacement / prepare	1s
default_tests / cross	1s
default_tests_with_upgrades / cross	1s
docker_no_secrets / cross	1s
full / cross	1s
minimal / cross	1s
no_cross / cross	1s
no_docker / cross	1s
no_test_scripts / cross	1s
no_tests / cross	1s
only_docker / cross	1s
test_with_alt_pkg / cross	1s
test_with_cargo_workspace / cross	1s
test_with_obsolete_pkg_replacement / cross	1s
check_full	1s
check_no_cross	1s
check_only_docker	1s
	29s

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