fix: also add pnpm.overrides for picomatch

The CI publish workflow uses pnpm, which doesn't honor npm's
'overrides' field. Add the equivalent pnpm.overrides so pnpm install
in CI also pins picomatch to 2.3.1 (rpt2 0.32.x glob compat).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JohnMcLear

package.json

@@ -53,6 +53,11 @@
   "overrides": {
     "picomatch": "2.3.1"
   },
+  "pnpm": {
+    "overrides": {
+      "picomatch": "2.3.1"
+    }
+  },
   "funding": {
     "type": "individual",
     "url": "https://etherpad.org/"