Add Steve Lasker as a distribution spec maintainer

[caniszczyk]

Steve Lasker would like to become an OCI distribution spec maintainer

We will have the existing maintainers vote via this PR with a LGTM / +1

• [ ] Derek McGowan (@dmcgowan)
• [ ] Jimmy Zelinskie (@jzelinskie)
• [ ] Josh Dolitsky (@jdolitsky)
• [ ] Mike Brown (@mikebrow)
• [ ] Stephen Day (@stevvooe)
• [ ] Vincent Batts (@vbatts)

[vbatts]

closing for now