Avoid using backslash in SQL string literals #6589

Job	Run time
get_postgres_versions_from_file	3s
rpm_build_tests (oraclelinux-8, 14)	1m 59s
deb_build_tests (debian-buster-all, 14)	2m 0s
rpm_build_tests (oraclelinux-8, 15)	2m 0s
deb_build_tests (debian-buster-all, 15)	1m 54s
rpm_build_tests (oraclelinux-8, 16)	1m 50s
deb_build_tests (debian-buster-all, 16)	2m 0s
rpm_build_tests (almalinux-8, 14)	1m 49s
deb_build_tests (debian-bookworm-all, 14)	2m 6s
rpm_build_tests (almalinux-8, 15)	1m 54s
deb_build_tests (debian-bookworm-all, 15)	2m 20s
rpm_build_tests (almalinux-8, 16)	1m 50s
deb_build_tests (debian-bookworm-all, 16)	2m 7s
rpm_build_tests (almalinux-9, 14)	1m 52s
deb_build_tests (debian-bullseye-all, 14)	1m 59s
rpm_build_tests (almalinux-9, 15)	1m 54s
deb_build_tests (debian-bullseye-all, 15)	1m 57s
rpm_build_tests (almalinux-9, 16)	2m 2s
deb_build_tests (debian-bullseye-all, 16)	2m 27s
deb_build_tests (ubuntu-focal-all, 14)	1m 54s
deb_build_tests (ubuntu-focal-all, 15)	1m 59s
deb_build_tests (ubuntu-focal-all, 16)	1m 56s
deb_build_tests (ubuntu-jammy-all, 14)	2m 13s
deb_build_tests (ubuntu-jammy-all, 15)	2m 14s
deb_build_tests (ubuntu-jammy-all, 16)	2m 11s
	48m 30s

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