Update users.yaml

[pwelch]

Summary

Add pwelch to help triage issues when needed.

Release Note

Documentation

[github-actions[bot]]

:tropical_drink: preview on sigstore-github-sync/sigstore/github-prod

Pulumi report

``` Previewing update (sigstore/github-prod) View Live: https://app.pulumi.com/sigstore/sigstore-github-sync/github-prod/previews/613ef14d-9d48-4535-aad6-ab6398a15afe @ Previewing update.... pulumi:pulumi:Stack: (same) [urn=urn:pulumi:github-prod::sigstore-github-sync::pulumi:pulumi:Stack::sigstore-github-sync-github-prod] + github:index/teamMembership:TeamMembership: (create) [urn=urn:pulumi:github-prod::sigstore-github-sync::github:index/teamMembership:TeamMembership::pwelch-triage] [provider=urn:pulumi:github-prod::sigstore-github-sync::pulumi:providers:github::default_6_2_2::174fec0b-80f0-4c0a-8139-f192fdd16b90] role : "member" teamId : "5643322" username : "pwelch" @ Previewing update.... @ Previewing update.... Resources: + 1 to create 602 unchanged ```