scripts/gh_release.py: fix ignoring PYMUPDF_SETUP_PY_LIMITED_API on Linux.

We need to add PYMUPDF_SETUP_PY_LIMITED_API to CIBW_ENVIRONMENT_PASS_LINUX.

Author: julian-smith-artifex-com

scripts/gh_release.py

@@ -359,6 +359,8 @@ def env_set(name, value, pass_=False):
             if pass_:
                 env_pass(name)
 
+        env_pass('PYMUPDF_SETUP_PY_LIMITED_API')
+        
         if os.environ.get('PYMUPDF_SETUP_LIBCLANG'):
             env_pass('PYMUPDF_SETUP_LIBCLANG')