Bump github/drone/go-scm to v1.31.0

[cod3rboy]

Change

• Bump github.com/drone/go-scm dependency to v1.31.0 to fix organization secret access for Gitea.
  PR: Implemented FindMembership method in organization service for gitea driver drone/go-scm#263

• Updated mocks with go generate to fix unimplemented method error during test run.

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