Remove comment that interferes with environment initialization

Author: rhpvorderman

.github/workflows/ci.yml

@@ -215,7 +215,6 @@ jobs:
             {project}/tests/test_igzip_lib.py
           CIBW_ENVIRONMENT_LINUX: >-
             PYTHON_ISAL_BUILD_CACHE=True
-            # This is in the docker container. So probably a '/tmp' will be available
             PYTHON_ISAL_BUILD_CACHE_FILE=/tmp/build_cache
             CFLAGS="-g0 -DNDEBUG"
           CIBW_ENVIRONMENT_WINDOWS: >-