Qiskit / qiskit / 18718499784

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Update `nom` to version 8 from 7 (#15204)

This was a breaking API change that required a simultaneous update to
`nom-unicode`, and some of the `nom` code was moved to a new
`nom-language` crate.

The main change here is in how parsers are invoked (we call
`Parser::parse` now instead of invoking the function directly), and how
combinators on the results of parsers are applied - the suggestion is to
use things like `map_res` via the `Parser` trait instead of the old
individual functions.

Several uses of `map_res` with infallible lambdas in the parser were
changed to use `map`.

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