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GH- [bpo-41815](): SQLite: fix segfault if backup called on closed database
Attempting to backup a closed database will trigger segfault:
```python
import sqlite3
target = sqlite3.connect(':memory:')
source = sqlite3.connect(':memory:')
source.close()
source.backup(target)
```
(cherry picked from commit bfee9fad84)
Co-authored-by: Peter McCormick <peter@pdmccormick.com>