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Upgrade minimum Rust version to 1.48.0 and remove proc-macro-hack.

Simon Sapin requested to merge topic/default/up into branch/default

This is the version in Debian Bullseye, now stable instead Buster which had 1.14.1.

Let’s treat this as a SemVer-breaking change, since this would break any remaining users with old compilers.

proc-macro-hack hack was only useful to support Rust versions older than 1.45

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