fix CI errors (6)

5 jobs for pybind11 in 8 minutes (queued for 3 seconds)
Status Job ID Name Coverage
  Build Gcc Nocheck
passed #6763
job_make_gcc_nocheck

00:02:04

 
  Test Gcc Nocheck
passed #6764
job_test_gcc_nocheck

00:00:22

 
  Build Python
passed #6765
job_build_python

00:02:52

 
  Build Clang
passed #6766
job_make_clang

00:02:25

 
  Test Clang
passed #6767
job_test_clang

00:00:15