Refresh the Unicode tables from prism 1.9.0

The three code point tables in this file are a copy of the ones in prism's
`src/encoding.c`, and had fallen behind: the version they came from predates
the uppercase letters that Unicode has added since. Refreshed against prism
1.9.0, which is the table Ruby 4.0 carries. Only the three lengths and the
values change.

Nothing in rbs reads them today -- `alpha_char`, `alnum_char` and
`isupper_char` have no callers, because the lexer asks the encoding for
nothing beyond the width of a character. They are part of the vendored
encoding layer all the same, and a vendored copy that has drifted from its
source is worse than no copy: the next reader has no way to tell which
Unicode version it is looking at.

Author: soutaro