flux-core & flux-sched: update versions and dependencies, fix git tags (#9610)

* flux: ensure git tags are always available

previous `--unshallow` would only run when `--depth 0` was used.  If
1--single-branch` was used, then the `.git/shallow` file would not exist
and `--unshallow` would not work.

add v0.6.0 and update dependencies accordingly

update dependencies to match latest flux versions

adds support for python 3
increases precision of czmq version required for older flux versions
adds new lz4 dependency