[github-maintenance] Fix pnpm-workspace.yaml configuration (#124)

Fixes misconfigured fields in `pnpm-workspace.yaml`.

See the tracking issue in github-maintenance.

<!-- github-maintenance:hash=20d1dfc3:script=pnpm-workspace-check -->

Co-authored-by: marimo-github-maintenance-bot[bot] <267743655+marimo-github-maintenance-bot[bot]@users.noreply.github.com>

Author: marimo-github-maintenance-bot[bot]

pnpm-workspace.yaml

@@ -1,4 +1,9 @@
-minimumReleaseAge: 10080
+minimumReleaseAge: 20160
 verifyDepsBeforeRun: install
 minimumReleaseAgeExclude:
   - "@marimo-team/*"
+packages:
+  - .
+blockExoticSubdeps: true
+trustPolicy: no-downgrade
+onlyBuiltDependencies: []