wikibooks: say the licence string covers imported text (v2#110)
Adds ", plus the licence of imported text" to the wikibooks licence string in src/sources.py (so stats.json) and in license-evidence.json (v2#110, 2A). The 3 pages that carry {{Cc-by-3.0-tekst}} are labelled CC-BY-SA-3.0 AND CC-BY-3.0, so "3.0, 4.0 or both" alone understated it.
Merge together with the wikinews PR (#146): its relabel writes this evidence string, and this PR's files are what a rerun gives with that code (only these two lines change; parquet, sidecar and card are byte-identical).
Tests: test_wikibooks_contract (now pins the evidence string) and test_wikimedia_contract pass with and without #146. The full suite here fails test_wikinews_contract as main does today, because main's wikinews sidecar has no source_notes; #146 fixes that. The other 2 failures are also on main.
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refs/pr/147 ref