ci: fix two PRs with same branch name but different forks canceling e… #762

Job	Run time
cargo-deny	1m 12s
Test (macOS-latest)	8m 47s
Test (windows-2022)	15m 25s
Lint	5m 25s
Compiletest (ubuntu-24.04)	8m 23s
Android (ubuntu-24.04, aarch64-linux-android)	8m 23s
Test (ubuntu-24.04)	7m 40s
Compiletest (macOS-latest)	6m 37s
Difftest (ubuntu-24.04)	12m 27s
Difftest (windows-2022)	22m 58s
Difftest (macOS-latest)	9m 57s
Compiletest (windows-2022)	15m 55s
test_success	3s
	2h 3m 12s

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