Prepare 1.3.4 release metadata #314

Job	Run time
no_std target build (wasm32-unknown-unknown)	22s
no_std target build (x86_64-unknown-linux-gnu)	18s
Format, lint, test, and audit	35s
Miri	1h 5m 49s
no_std target build (aarch64-unknown-linux-gnu)	21s
no_std target build (thumbv7em-none-eabihf)	17s
Platform tests (ubuntu-latest)	36s
Platform tests (macos-15-intel)	1m 12s
no_std target build (x86_64-unknown-freebsd)	21s
Platform tests (macos-15)	54s
Platform tests (windows-latest)	39s
Platform tests (macos-latest)	34s
Platform tests (macos-26)	31s
Rust compatibility (1.91.0)	26s
Rust compatibility (1.92.0)	22s
Rust compatibility (1.90.0)	23s
Rust compatibility (1.93.0)	27s
Rust compatibility (1.95.0)	26s
Rust compatibility (1.94.0)	26s
Rust compatibility (1.96.1)	14s
Rust compatibility (1.96.0)	27s
	1h 15m 40s

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