Update Hunspell 18f4056 -> cd42fb1

https://github.com/hunspell/hunspell/commit/cd42fb1

In our Chromium patch, we replaced some malloc code with
calloc to zero the array for performance and safety. However,
this commit replaces malloc with new. We'd like to keep our
zeroing logic, so just resolve the conflict by using () with
new so that the array is still zero'd.

Bug: b:325123679
Change-Id: I1a815de70affa1cad8f0e889747e7f27d242bf10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6498055
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Michael Cui <mlcui@google.com>
Cr-Commit-Position: refs/heads/main@{#1454767}