SQLite Release 3.50.2

[jlmjanssen]

SQLite Release 3.50.2 On 2025-06-28

1. Fix the concat_ws() SQL function so that it includes empty strings in the concatenation. Forum post 52503ac21d.
2. Fix the file-io extension (used by the CLI) so that it can be built using the MinGW compiler chain.
3. Avoid writing frames with no checksums into the wal file if a savepoint is rolled back after dirty pages have already been spilled into the wal file. Forum post b490f726db.
4. Fix the Bitvec object to avoid stack overflow when the database is within 60 pages of its maximum size.
5. Fix a problem with UPDATEs on fts5 tables that contain BLOB values.
6. Fix an issue with transitive IS constraints on a RIGHT JOIN.
7. Raise an error early if the number of aggregate terms in a query exceeds the maximum number of columns, to avoid downstream assertion faults.
8. Ensure that sqlite3_setlk_timeout() holds the database mutex.
9. Fix typos in API documentation.