Update minimum required Rust version to 1.35.0

This change updates the minimum required version of Rust to 1.35.0. The
motivation for doing so is at least two fold. First, next we want to
bump the nitrokey crate to version 0.4.0 and it requires Rust 1.34.0 as
a minimum. Second, and perhaps more importantly, though, in 1.34.0 a
clippy lint regressed, breaking our pipeline. That is the reason why we
are going to 1.35.0 instead.

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