bugfix: gitstat missed commit not push

bugfix for v1.12.0: a typo made "commit but not pushed" not be detected with "git stat". This is fixed.

gitstat add --serial option to run non-asyncio version.

functionalize asyncio.subprocess, improve logic

Timeout individual Git operations instead of overall, allowing one operation to timeout without aborting all other pending operations.

This is especially useful for "git pull" and "git fetch". It's implemented in src/gitutils/git.py:subprocess_asyncio().
The calling async function calls with asyncio.wait_for() to implement and catch the timeout.

gitpull,gitfetch: no prompt default. Python >= 3.9

gitpull,gitfetch: new default of skipping dirs needing password

use -p --prompt option to again prompt for password

pyproject.toml only

PEP621: use pyproject.toml only

enhance CI, test connection fetchpull, python >= 3.8 required

v1.10.0

for quality/ease of maint, required python >= 3.8

git{pull,fetch}: print what's changed on remote

v1.9.0

doc

require Git >= 2.23 for gitbranch

Older Git makes these mass branch-switching and checking operations cumbersome, so require newer Git for reliability.

git_branch: compatible with old Git

v1.8.2

modernize type anno

gitbranch: multiple default branches

gitbranch: default to ["main", "master"] as defaults

Improve asynchronous, python -m runnable

• Use asyncio more effectively to emit results "as_completed" which is essential for very large numbers of repos
• allow python -m gitutils.branch and similar as alternative way to run