Change: Mark pontos.git.git as private module explicitly

The `pontos.git.git` module should not be considered as a public API of
pontos. Therefore rename it to `pontos.git._git` to user Python naming
convention to mark it as a private module.

pontos/git/__init__.py

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 #
 
-from .git import (
+from ._git import (
     DEFAULT_TAG_SORT_SUFFIX,
     ConfigScope,
     Git,

pontos/release/sign.py

@@ -18,7 +18,7 @@
 from rich.progress import TextColumn
 
 from pontos.errors import PontosError
-from pontos.git.git import GitError
+from pontos.git import GitError
 from pontos.github.api import GitHubAsyncRESTApi
 from pontos.helper import AsyncDownloadProgressIterable
 from pontos.release.command import AsyncCommand

pontos/testing/__init__.py

@@ -13,7 +13,7 @@
 from pathlib import Path
 from typing import Any, AsyncIterator, Awaitable, Generator, Iterable, Optional
 
-from pontos.git.git import exec_git
+from pontos.git._git import exec_git
 from pontos.helper import add_sys_path, ensure_unload_module, unload_module
 
 __all__ = (

pontos/version/helper.py

@@ -5,8 +5,7 @@
 
 from typing import Iterator, Optional
 
-from pontos.git import Git, TagSort
-from pontos.git.git import DEFAULT_TAG_SORT_SUFFIX
+from pontos.git import DEFAULT_TAG_SORT_SUFFIX, Git, TagSort
 from pontos.version.errors import VersionError
 
 from .version import ParseVersionFuncType, Version