Attempt to fix bug in benchmark

[DimitriPapadopoulos]

Works only with actions/checkout@v1.

With actions/checkout@v2:

▶ Run go install golang.org/x/perf/cmd/benchstat@latest
go: downloading golang.org/x/perf v0.0.0-20240806191124-3f62[15](https://github.com/suyashkumar/dicom/actions/runs/10642057643/job/29504006392?pr=339#step:5:16)1e343c
go: downloading github.com/aclements/go-moremath v0.0.0-20210112150236-f10218a38794
New Commit:
98ff6e875417e3535e2006b092594c349fff6d87
HEAD is now at 98ff6e8 Merge a734a6[16](https://github.com/suyashkumar/dicom/actions/runs/10642057643/job/29504006392?pr=339#step:5:17)a5120f4e34238665ac7ff643003528d7 into cb3864efadad3b9fd1dc331f5763bb960bc79bad
error: pathspec 'main' did not match any file(s) known to git
Error: Process completed with exit code 1.