Linting: Aggressive ruff pass (ruff v0.3.4)

[tony]

ruff check --select ALL . --fix --unsafe-fixes --preview --show-fixes; ruff format .

Fixed 39 errors:

• conftest.py:
  2 × PT003 (pytest-extraneous-scope-function)
  1 × PIE790 (unnecessary-placeholder)
• docs/conf.py:
  1 × RET505 (superfluous-else-return)
• src/vcspull/_internal/config_reader.py:
  4 × RET505 (superfluous-else-return)
  1 × PLR6201 (literal-membership)
• src/vcspull/cli/__init__.py:
  2 × TID252 (relative-imports)
  1 × I001 (unsorted-imports)
  1 × RET505 (superfluous-else-return)
• src/vcspull/cli/sync.py:
  4 × TID252 (relative-imports)
• src/vcspull/config.py:
  1 × PLR5501 (collapsible-else-if)
  1 × E303 (too-many-blank-lines)
  1 × RSE102 (unnecessary-paren-on-raise-exception)
  1 × RET504 (unnecessary-assign)
• src/vcspull/exc.py:
  1 × ISC001 (single-line-implicit-string-concatenation)
• src/vcspull/log.py:
  2 × E303 (too-many-blank-lines)
  2 × RET504 (unnecessary-assign)
  1 × FLY002 (static-join-to-f-string)
• src/vcspull/util.py:
  1 × PLR1733 (unnecessary-dict-index-lookup)
• tests/fixtures/example.py:
  2 × PIE804 (unnecessary-dict-kwargs)
• tests/test_config.py:
  1 × PT001 (pytest-fixture-incorrect-parentheses-style)
• tests/test_config_file.py:
  2 × PT003 (pytest-extraneous-scope-function)

[codecov]

Codecov Report

Attention: Patch coverage is 80.76923% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 84.35%. Comparing base (7297ba5) to head (1795702).

Files	Patch %	Lines
src/vcspull/_internal/config_reader.py	20.00%	2 Missing and 2 partials ⚠️
src/vcspull/log.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #442      +/-   ##
==========================================
+ Coverage   84.32%   84.35%   +0.02%     
==========================================
  Files          16       16              
  Lines         938      933       -5     
  Branches      182      182              
==========================================
- Hits          791      787       -4     
+ Misses         93       92       -1     
  Partials       54       54              

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