Drop the stale sharp entry from pnpm-workspace.yaml's allowBuilds

pnpm re-scaffolds this block from the current dependency tree when it
finds unapproved build scripts; sharp is no longer a candidate, so
pnpm install can't fill it in and errors out with ERR_PNPM_IGNORED_BUILDS.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

pnpm-workspace.yaml

@@ -2,5 +2,4 @@ allowBuilds:
   argon2: true
   better-sqlite3: true
   esbuild: true
-  sharp: false
   unrs-resolver: false