This update for cpp-httplib fixes the following issues:

- CVE-2026-21428: Fixed a server-side request forgery via header injection (boo#1255835)
- CVE-2026-22776: Fixed unsafe handling of compressed HTTP request that could cause a denial of service (boo#1256518)
- CVE-2026-28434: Fixed that the default exception handler could leak e.what() to clients via EXCEPTION_WHAT response header (boo#1259221)
- CVE-2026-28435: Fixed a payload size limit bypass via gzip decompression in ContentReader (streaming) that could lead to denial of service (boo#1259220)
- CVE-2026-29076: Fixed denial of service via crafted HTTP POST request (boo#1259373)