fix: add workflow permissions

Author: thomasrockhu-codecov

.github/workflows/bench.yml

@@ -1,5 +1,8 @@
 name: Benchmarks
 
+permissions:
+  contents: read
+
 on:
   push:
     branches:

.github/workflows/ci.yml

@@ -1,5 +1,8 @@
 name: CI
 
+permissions:
+  contents: read
+
 on:
   push:
     branches:

.github/workflows/enforce-license-compliance.yml

@@ -1,5 +1,8 @@
 name: Enforce License Compliance
 
+permissions:
+  contents: read
+
 on:
   pull_request:
     branches: [main, master]