Change python3.4 to python3
### Existing feature/capability to improve Job to build docs needs to be updated to use `python3` instead of `python3.4` to match recent changes upstream. ### Testing requirements None ### Define success Pipeline passes again ### Environment info - OpenCPI Version: develop - Type of install (RPM or source): Source - Operating System and version (`uname -a`): - Link to your project on GitLab (optional): ### Links/references opencpi/opencpi!169
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