Log Message:
(textproc/R-stringi) Updated 1.7.6 to 1.7.12

## 1.7.12 (2023-01-09)

* [BUGFIX] Fixed some potential problems reported by `rchk`.

* [NOTE] [BACKWARD INCOMPATIBLE CHANGE IF ICU >= 72]
  If building against ICU >= 72,
  note a backward incompatible change: `@` is no longer a word break;
  see <https://github.com/unicode-org/cldr/pull/2256> for more details.

## 1.7.8 (2022-07-11)

* [DOCUMENTATION] Paper on *stringi* has been published in
    the *Journal of Statistical Software*;
    see <https://doi.org/10.18637/jss.v103.i02>.

* [BUGFIX] #473, #397: Fixed buffer overflow in `stri_dup`.
    `stri_dup`, `stri_paste`, ... fail more graciously on attempts to
    generate strings of length >= 2^31 each.

* [BUILD TIME] #480: Using `Rf_isNull` instead of `isNull`.

* [DOCUMENTATION] #462: That the `numeric=TRUE` collator
    does not handle negative numbers correctly is now mentioned in the manual.