Fix exponential backoff calculation #25406

Job	Run time
Classify changes	4s
Bootstrap Pants, test and lint Rust (Linux-x86_64)	13m 53s
Bootstrap Pants, test Rust (macOS13-x86_64)	9m 58s
Bootstrap Pants, test Rust (Linux-ARM64)	17m 36s
Build wheels (Linux-x86_64)	0s
Build wheels (Linux-ARM64)	0s
Build wheels (macOS13-x86_64)	0s
Build wheels (macOS14-ARM64)	0s
Ensure PR has release notes	2s
Test Python (Linux-x86_64) Shard 1/10	4m 56s
Test Python (Linux-x86_64) Shard 0/10	4m 56s
Lint Python and Shell	3m 35s
Test Python (Linux-x86_64) Shard 2/10	4m 55s
Test Python (Linux-x86_64) Shard 3/10	4m 56s
Test Python (Linux-x86_64) Shard 4/10	4m 56s
Test Python (Linux-x86_64) Shard 5/10	4m 57s
Test Python (Linux-x86_64) Shard 6/10	4m 55s
Test Python (Linux-x86_64) Shard 7/10	4m 55s
Test Python (Linux-x86_64) Shard 9/10	4m 56s
Test Python (Linux-x86_64) Shard 8/10	4m 55s
Test Python (Linux-ARM64)	1s
Test Python (macOS13-x86_64)	1s
Set Merge OK	1s
Merge OK	1s
	1h 34m 29s

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