Revise to autocxx-bindgen 0.69.4. #1916

Job	Run time
Clippy	1m 7s
Format	7s
Examples Rust nightly	4m 34s
Docs	1m 44s
Examples Rust beta	4m 32s
Test forcing wrapper generation	9m 7s
Examples Rust stable	4m 52s
Outdated	10s
Address Sanitizer	15m 21s
Examples macOS	3m 22s
Examples Windows (gnu)	7m 8s
Test Rust nightly	12m 6s
Examples Windows (msvc)	5m 43s
Test Rust beta	11m 1s
Test Rust stable	12m 5s
Test macOS	10m 24s
Test Windows (msvc)	16m 31s
	1h 59m 54s

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