tests

Fix leaks when database is closed while in sync iteration #853

Job	Run time
build_stable_rust	1m 51s
Testing with Valgrind on ${{ matrix.os }}	0s
Basic WASM build	0s
Building macOS libraries	0s
Build XCFramework	0s
Rust unit tests on ${{ matrix.os }}	0s
Building Linux libraries	0s
Testing on ${{ matrix.os }}	0s
Building Windows libraries	0s
Building Android libraries	0s
	1m 51s

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