c++: Use -std=c++20 in testsuite default std list
C++20 has been official for a while now. gcc/testsuite/ChangeLog: * lib/g++-dg.exp: Change 2a to 20.
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C++20 has been official for a while now. gcc/testsuite/ChangeLog: * lib/g++-dg.exp: Change 2a to 20.