[HarfBuzz] ICU detection fix in HarfBuzz obsoletes our workaround

Harfbuzz 0.9.14 merged a patch for icu detection without pkg-config
files, which obsoletes the workaround we had for a while.

This commit bumps harfbuzz to version 0.9.14.

Reference: https://bugs.webkit.org/show_bug.cgi?id=112166

Reviewed by: Hugo Lima