This was added in libphonenumber 8.8.4, and without it three of the
auto-generated tests fail. Also update the BB line to match the current
libphonenumber regex.
Coverage remained the same at 99.967% when pulling 9ac26eb24bac5194fa2cc74120862812761fae07 on dracos:fix-bs-special-rate-tests into 850ad3185171a00c5962b73dfc169ce08f1cab9a on DrHyde:master.
This was added in libphonenumber 8.8.4, and without it three of the auto-generated tests fail. Also update the BB line to match the current libphonenumber regex.