Upgrade sqd from v1.0.2 to released v1.2.0 and align the minimum Go version and CI builders to 1.23. Functional tests use EDISPATCHER_TEST_POSTGRES_PORT for isolated instances; Docker-linked POSTGRES_PORT URLs are deliberately ignored and the default numeric port remains 5432. Regression tests reproduce the exact environment collision seen in job 215298. Unit output is streamed with pipefail, and a failure summary is generated in after_script so diagnostics survive a failed test. Validated with GOWORK=off on Go 1.23.4: full -race suite against PostgreSQL 12.2 with the conflicting Docker variable set, go vet and module verification. Recommended release after merge: v3.1.0. pg_repo and this library can be released independently; downstream application updates wait for both final tags. Task: https://fsd-group.atlassian.net/browse/IN-785