Update toolchain nightly-2026-03-14 #1543

Job	Run time
Android (ubuntu-latest, aarch64-linux-android)	8m 19s
cargo-deny	1m 30s
Compiletest (macOS-latest)	8m 24s
Test (macOS-latest)	16m 5s
Compiletest (ubuntu-latest)	7m 9s
Test (windows-latest)	23m 6s
Compiletest (windows-latest)	16m 17s
Difftest (windows-latest)	22m 57s
Difftest (macOS-latest)	13m 5s
Lint	5m 46s
Test (ubuntu-latest)	11m 59s
Difftest (ubuntu-latest)	11m 23s
test_success	2s
	2h 26m 2s

Provide feedback