ci: set minimal permissions on workflows (python-ldap#525)

Signed-off-by: Diogo Teles Sant'Anna <[email protected]>

Author: diogoteles08

.github/workflows/ci.yml

@@ -3,6 +3,9 @@ name: CI
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   distros:
     name: "Ubuntu with Python ${{ matrix.python-version }}"

.github/workflows/tox-fedora.yml

@@ -2,6 +2,9 @@ on: [push, pull_request]
 
 name: Tox on Fedora
 
+permissions:
+  contents: read
+
 jobs:
   tox_test:
     name: Tox env "${{matrix.tox_env}}" on Fedora