Pin PostCSS and tar dependency overrides

- Upgrade workspace-wide PostCSS to 8.5.18
- Upgrade workspace-wide tar to 7.5.21

Author: badcuban

pnpm-lock.yaml

@@ -48,7 +48,9 @@ overrides:
   "@types/node": "catalog:"
   effect: "catalog:"
   fast-uri: 3.1.4
+  postcss: 8.5.18
   sharp: 0.35.3
+  tar: 7.5.21
   vite: "catalog:"
   vitest: "catalog:"
   yaml: "catalog:"