Fix renderer assertion mismatches in test_rendering.py

[Copilot]

Four test assertions were checking for meta["renderer"] == "citeproc-py" but the implementation returns "citeproc", causing test failures.

Changes

• Fixed assertions in test_render_bibliography_vancouver_style (line 69)
• Fixed assertions in test_render_bibliography_chicago_style (line 137)
• Fixed assertions in test_render_bibliography_empty_citations (line 201)
• Fixed assertions in test_render_bibliography_with_locale (line 227)

All tests now align with the actual return value from render_bibliography_to_strings():

# Implementation returns:
{"renderer": "citeproc", "style": style, "locale": locale}

# Tests now correctly assert:
assert meta["renderer"] == "citeproc"

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