Fix invalid fallback in bench-run.sh #11914

Job	Run time
Acceptance test node versions	4s
Build artifacts	1m 27s
Testing chores	2m 20s
ubuntu-latest w/ Node.js 18.x (1/2)	7m 17s
ubuntu-latest w/ Node.js 24.x (1/2)	6m 7s
ubuntu-latest w/ Node.js 20.x (1/2)	6m 34s
ubuntu-latest w/ Node.js 22.x (1/2)	6m 1s
windows-latest w/ Node.js 22.x (1/3)	5m 40s
ubuntu-latest w/ Node.js 26.x (1/2)	6m 9s
windows-latest w/ Node.js 18.x (1/3)	5m 44s
ubuntu-latest w/ Node.js 26.x (2/2)	5m 7s
macos-latest w/ Node.js 18.x (1/3)	4m 24s
macos-latest w/ Node.js 22.x (2/3)	4m 47s
windows-latest w/ Node.js 22.x (3/3)	4m 59s
macos-latest w/ Node.js 18.x (3/3)	2m 28s
ubuntu-latest w/ Node.js 22.x (2/2)	5m 32s
windows-latest w/ Node.js 22.x (2/3)	8m 39s
macos-latest w/ Node.js 22.x (3/3)	3m 9s
macos-latest w/ Node.js 18.x (2/3)	5m 25s
windows-latest w/ Node.js 18.x (2/3)	11m 28s
macos-latest w/ Node.js 22.x (1/3)	3m 13s
ubuntu-latest w/ Node.js 20.x (2/2)	5m 55s
ubuntu-latest w/ Node.js 24.x (2/2)	5m 24s
windows-latest w/ Node.js 18.x (3/3)	6m 13s
ubuntu-latest w/ Node.js 18.x (2/2)	6m 29s
Big-endian debian w/ Node.js latest (${{ matrix.shard }})	0s
	2h 10m 35s

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