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In recent versions of Clang, using -std=c++20 (and later) implies LSV when compiling with modules. This change resulted in making our LSV job redundant with the regular modules job, which uses the latest Standard. This patch increases the coverage of our CI without increasing its cost by pinning the LSV job to use C++17, which normally doesn't use LSV. A related question is whether we should add coverage for non-LSV builds using Clang modules.