fix: remove stale vitest entry from packages/db lockfile

vitest was erroneously added to the packages/db importer in
pnpm-lock.yaml during factory test setup, but packages/db/package.json
does not declare vitest as a dependency. This caused CI to fail with
ERR_PNPM_OUTDATED_LOCKFILE.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

pnpm-lock.yaml

@@ -166,9 +166,6 @@ importers:
       typescript:
         specifier: ^5.7.3
         version: 5.9.3
-      vitest:
-        specifier: ^3.0.4
-        version: 3.2.4(@types/node@22.19.15)(jiti@2.6.1)(jsdom@26.1.0)(lightningcss@1.32.0)(terser@5.46.1)(tsx@4.21.0)
 
   packages/types:
     devDependencies: