fix(oidc): reject backslash authority forms in relative redirects #2514

Job	Run time
compile_and_lint	5m 48s
windows_test	9m 0s
docker_build (linux/amd64, minimal)	4m 25s
docker_build (linux/arm64, duckdb)	5m 48s
docker_build (linux/arm/v7, minimal)	5m 0s
hurl_examples	6s
docker_build (linux/arm64, minimal)	5m 44s
docker_build (linux/amd64, duckdb)	4m 29s
test (oracle, oracle, Driver=Oracle 21 ODBC driver;Dbq=//127.0.0.1:1521/FREEPDB1;Uid=root;Pwd=Pas...	3m 28s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	3m 28s
test (sqlite, sqlite::memory:)	3m 28s
test (mssql, mssql, mssql://root:Password123!@127.0.0.1/sqlpage)	3m 28s
test (mysql, mysql, mysql://root:Password123!@127.0.0.1/sqlpage)	3m 28s
test (postgres, postgres, postgres://root:Password123!@127.0.0.1/sqlpage)	3m 28s
playwright	3m 28s
hurl (${{ matrix.example }})	1s
docker_push	1s
	1h 4m 38s

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