Remove non-used std 11 and compilers

boostorg / multiprecision

Boost.Multiprecision

Boost Software License 1.0

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Closed ckormanyos closed 1 year ago

ckormanyos commented 1 year ago

It seems like some tiny artifacts can be removed from GHA script YAML.

The removal of the 11 in 11, 14, 17 seems OK since no tests were running there.
It seems like g++-9 and clang++ aren't used and aren't needed in the ubuntu-focal-slow-tests job in which they were installed.