Update git-sync container version to add support for latest features and env vars

[LaVLaS]

Is your feature request related to a problem? Please describe.
Upgrade the git-sync container to the latest release that adds support for additional git features and parameters.

Describe the solution you'd like
Update the airflow operator git-sync default repo and tag so a newer image and add a field to the dag.git spec to allow a user to specify a list of env vars that will be passed to git-sync

dags:
  git:
    git-sync-extra-env:
      GIT_SYNC_ROOT: $HOME/alt_dir/
      GIT_SYNC_SUBMODULES: shallow

Describe alternatives you've considered
N/A

Additional context
The primary goal is to use the updated image git-sync image.