rustup: update to `nightly-2025-06-23` (~1.89). #629

Job	Run time
Test (macOS-latest)	5m 38s
Test (windows-2022)	5m 30s
Test (ubuntu-24.04)	5m 34s
Android (ubuntu-24.04, aarch64-linux-android)	5m 34s
Difftest (macOS-latest)	5m 42s
Difftest (windows-2022)	5m 30s
Difftest (ubuntu-24.04)	5m 34s
Lint	5m 23s
Compiletest (macOS-latest)	5m 36s
Compiletest (ubuntu-24.04)	4m 14s
Compiletest (windows-2022)	5m 29s
cargo-deny	1m 15s
test_success	3s
	1h 1m 2s

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