Fix deploy-posit workflow failure caused by renv lockfile drift during manifest generation

[Copilot]

The deploy-posit GitHub Actions job failed while generating manifest.json because rsconnect::writeManifest() detected an out-of-sync renv library vs lockfile state in CI. This PR updates the deploy workflow to synchronize the lockfile immediately before manifest creation.

• Workflow fix (.github/workflows/deployment.yaml)

  • In the Create manifest.json step, added a lockfile sync between restore and manifest generation.
  • This ensures rsconnect sees a consistent renv state after dependency repair/update operations in CI.

• Deployment behavior

  • Manifest creation now runs against a synchronized dependency graph, avoiding parseRenvDependencies() failure in deploy-posit.

renv::restore(prompt = FALSE, clean = TRUE)
renv::snapshot(prompt = FALSE, type = "all")
rsconnect::writeManifest()