Add empty permission block

As requested by zizmor

Author: oschwald

.github/workflows/codeql-analysis.yml

@@ -8,6 +8,8 @@ on:
   schedule:
     - cron: '0 11 * * 2'
 
+permissions: {}
+
 jobs:
   CodeQL-Build:
 

.github/workflows/release.yml

@@ -10,6 +10,8 @@ on:
     types:
       - published
 
+permissions: {}
+
 jobs:
   build:
     name: Build source distribution

.github/workflows/test.yml

@@ -6,6 +6,8 @@ on:
   schedule:
     - cron: '3 15 * * SUN'
 
+permissions: {}
+
 jobs:
   build:
 

.github/workflows/zizmor.yml

@@ -6,6 +6,8 @@ on:
   pull_request:
     branches: ["**"]
 
+permissions: {}
+
 jobs:
   zizmor:
     name: zizmor latest via PyPI