Update workflows permissions (#77)

Author: AdrienVannson

.github/workflows/ci.yml

@@ -8,6 +8,9 @@ on:
     branches:
       - '**'
 
+permissions:
+  contents: read
+
 jobs:
   tests:
     name: ${{ matrix.os }} / ${{ matrix.python-version }}

.github/workflows/code-quality.yml

@@ -8,6 +8,9 @@ on:
     branches:
       - '**'
 
+permissions:
+  contents: read
+
 jobs:
   check-formatting:
     name: Check code/doc formatting