Add explicit permissions to example workflows for security

Co-authored-by: thoughtparametersllc <194255310+thoughtparametersllc@users.noreply.github.com>

Author: Copilot

.github/workflows/example-advanced.yml

@@ -9,6 +9,8 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     strategy:
       matrix:
         python-version: ['3.9', '3.10', '3.11', '3.12']

.github/workflows/example-basic.yml

@@ -9,6 +9,8 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     steps:
       - name: Checkout code