pymupdf: drop CIBW_BUILD_VERBOSITY

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: luhenry

.github/workflows/build-pymupdf.yml

@@ -63,7 +63,6 @@ jobs:
           only: ${{ matrix.python }}-manylinux_riscv64
         env:
           CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
-          CIBW_BUILD_VERBOSITY: '1'
           # mupdf's C++ bindings are generated by parsing its headers with
           # libclang; the `libclang` PyPI wheel setup.py asks for by default has
           # no riscv64 build, so use the image's own libclang.so instead (dnf