fix: create target directory in fuzz targets #696

Job	Run time
cargo fmt --all -- --check	5s
GNU test suite	32s
cargo test (windows-latest)	5m 35s
cargo test (macOS-latest)	2m 11s
Code Coverage (windows-latest, windows)	7m 44s
cargo clippy -- -D warnings (macOS-latest)	16s
cargo clippy -- -D warnings (ubuntu-latest)	16s
cargo check (ubuntu-latest)	13s
cargo clippy -- -D warnings (windows-latest)	51s
cargo test (ubuntu-latest)	50s
Code Coverage (ubuntu-latest, unix)	1m 58s
Code Coverage (macos-latest, macos)	4m 56s
cargo check (windows-latest)	53s
cargo check (macOS-latest)	9s
	26m 29s

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