Remove CIBW_REPAIR_WHEEL_COMMAND entry in build.yml

Based on the `cibuildwheel` docs:

    https://cibuildwheel.pypa.io/en/stable/options/

If `CIBW_REPAIR_WHEEL_COMMAND` is not specified, then the default
behaviour for Linux is our desired behaviour:

    auditwheel repair -w {dest_dir} {wheel}

Because `CIBW_REPAIR_WHEEL_COMMAND` was set before to "", the
repair step was being skipped.

Author: molinav

.github/workflows/build.yml

@@ -113,7 +113,6 @@ jobs:
           CIBW_BEFORE_ALL: ${{ matrix.before_all }}
           CIBW_ENVIRONMENT: ${{ matrix.environment }}
           CIBW_BUILD_REQUIRES: "cython>=0.29,<3.1"
-          CIBW_REPAIR_WHEEL_COMMAND: ""
         with:
           package-dir: packages/basemap