Pipeline failures due to github repos

Sometimes, and only sometimes, the pipeline failed, because the dev setup or install tests cannot clone example parser due to the egginfo already existing.

Synchronizing submodule url for 'dependencies/python_common'
$ git submodule update --init --jobs=4
From https://gitlab.mpcdf.mpg.de/nomad-lab/parser-crystal
 * [new branch]      refactor   -> origin/refactor
Submodule path 'dependencies/parsers/crystal': checked out '447cb20b5c8fb095bac5861721b8de96502b5058'
error: Your local changes to the following files would be overwritten by checkout:
	exampleparser.egg-info/SOURCES.txt
Please commit your changes or stash them before you switch branches.
Aborting
From https://gitlab.mpcdf.mpg.de/nomad-lab/parser-wien2k
   cf6abfe..0bfb17d  master     -> origin/master
Submodule path 'dependencies/parsers/wien2k': checked out '0bfb17daec156d26110d55cd0918d8fb584f7fac'
Unable to checkout 'c378ce3c667fa0b6bd93ecdfd5699b7b9e165fa5' in submodule path 'dependencies/parsers/example'
ERROR: Job failed: exit code 1