[BACKPORT] Fix reproducibility of prepared provider packages (fix flit frontend)… #43687
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… (#43683)
After some checks it turned out that reproducibility of produced packages depends not only on the build backend configured for the project but also on the build front-end used - because frontend is the one to modify meta-data in prepared packages - including the build tool used, it's version and metadata version supported by the front-end.
That's why in order to maintain reproducibility for anyone who builds the packages, we have to pin not only the build backend in pyproject.toml (flit-core) but also build fronted used (flit).
Since package preparation is done with breeze, we can do it by pinning flit (and just in case also flit-core) so that anyone who builds specific version of the package will use exactly the same flit as the person who built the original packages.
This way we will avoid reproducibility problems experienced with 1.5.0 release of FAB.
(cherry picked from commit 18ea01c)
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