Pinning to 17 is no longer necessary, latest now points to 17
Reverts 17da3fe

Unpin unicode 17 in CI, revert to latest

Reduce execution time by 44% in 0%-nonascii case and by 32% in 10%-nonascii.
Reduce the static data size ~200 bytes.

    warning: long literal lacking separators
      --> src/tables.rs:12:38
       |
    12 | pub(crate) const ASCII_START: u128 = 0x7fffffe07fffffe0000000000000000;
       |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider: `0x07ff_fffe_07ff_fffe_0000_0000_0000_0000`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
       = note: `-W clippy::unreadable-literal` implied by `-W clippy::pedantic`
       = help: to override `-W clippy::pedantic` add `#[allow(clippy::unreadable_literal)]`

    warning: long literal lacking separators
      --> src/tables.rs:13:41
       |
    13 | pub(crate) const ASCII_CONTINUE: u128 = 0x7fffffe87fffffe03ff000000000000;
       |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider: `0x07ff_fffe_87ff_fffe_03ff_0000_0000_0000`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal

Extract const promoted zero to a named static