[Bug]: step certificate inspect no longer works for stdin

[4x0v7]

Steps to Reproduce

Have any certificate

$ cat cert.crt | step certificate inspect
error reading -: no such file or directory

$ cat cert.crt | step certificate inspect -
error reading -: no such file or directory

Your Environment

• OS - Linux & Windows
• step CLI Version - 0.26.1

Expected Behavior

Certificate details are printed

Actual Behavior

error reading -: no such file or directory

Additional Context

This worked in 0.26.0 on both Windows and Linux
Have confirmed this issue exists on both Windows and Linux

Related smallstep/scoop-bucket#4

Contributing

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[hslatman]

Hey @4x0v7, thanks for reporting this issue. It seems to be a regression. I've opened smallstep/crypto#490, which fixes the method that the CLI uses for this functionality.