Skip codesign for tzdata and certifi data files on Mac

These packages contain only data files (timezone definitions and CA
certificates), not executables. Signing hundreds of tzdata files
causes Apple's timestamp service to rate-limit or time out.

Fixes #1070

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rly

package.json

@@ -105,6 +105,10 @@
       "gatekeeperAssess": false,
       "entitlements": "entitlements.mac.inherit.plist",
       "entitlementsInherit": "entitlements.mac.inherit.plist",
+      "signIgnore": [
+        "flask/_internal/tzdata/",
+        "flask/_internal/certifi/"
+      ],
       "extraResources": [
         {
           "from": "./build/flask/nwb-guide",