ci: fix version in PDF doc
Due to missing git the version is not found in the PDF manual: https://project-allpix-squared.web.cern.ch/usermanual/allpix-manual-latest.pdf
Edited by Stephan Lachnit
Due to missing git the version is not found in the PDF manual: https://project-allpix-squared.web.cern.ch/usermanual/allpix-manual-latest.pdf