Remove unused IPDATA_API_KEY secret from CI workflows

Tests use mocked fetch and don't make real API calls.

https://claude.ai/code/session_01UabaLo3R3sXovyxaZo2yCF

Author: claude

.github/workflows/default.yml

@@ -28,6 +28,4 @@ jobs:
       - name: Install dependencies
         run: npm ci
       - name: Test
-        env:
-          IPDATA_API_KEY: ${{ secrets.IPDATA_API_KEY }}
         run: npm test

.github/workflows/release.yml

@@ -28,8 +28,6 @@ jobs:
       - name: Install dependencies
         run: npm ci
       - name: Test
-        env:
-          IPDATA_API_KEY: ${{ secrets.IPDATA_API_KEY }}
         run: npm test
 
   release: