Revise to autocxx-bindgen 0.69.4. #1914

Job	Run time
Docs	2m 38s
Examples Rust nightly	4m 47s
Clippy	1m 37s
Examples Rust beta	4m 17s
Format	11s
Examples Rust stable	4m 25s
Test forcing wrapper generation	7m 29s
Examples macOS	3m 41s
Outdated	12s
Examples Windows (gnu)	7m 18s
Address Sanitizer	13m 32s
Examples Windows (msvc)	4m 37s
Test Rust nightly	7m 56s
Test Rust beta	8m 28s
Test Rust stable	8m 45s
Test macOS	7m 33s
Test Windows (msvc)	15m 17s
	1h 42m 43s

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