Fix simple typo: pagckage -> package

# Issue Type

[x] Bug (Typo)

# Steps to Replicate

1. Examine git_repo/services/service.py.
2. Search for `pagckage`.

# Expected Behaviour

1. Should read `package`.

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR.

https://github.com/timgates42/git-repo/pull/new/bugfix_typo_package

Thanks.

Open git_repo/services/service.py and search for `pagckage`. Confirm the occurrence should read `package`, then verify the typo is gone; a prepared branch is linked in the issue, so check that work before starting.

Written by the indexing model from the issue text.