This update for postgresql13 fixes the following issues:

- CVE-2021-3677: Fixed memory disclosure in certain queries (bsc#1189748).

- Fixed build with llvm12 on s390x (bsc#1185952).
- Re-enabled icu for PostgreSQL 10 (bsc#1179945).
- Made the dependency of postgresqlXX-server-devel on llvm and clang optional (bsc#1187751).
- llvm12 breaks PostgreSQL 11 and 12 on s390x. Use llvm11 as a workaround (bsc#1185952).