fix(workflows): elevate GITHUB_TOKEN permissions when needed (#822)

I am not 100% sure I was able to fix all the cases in which we
need higher permissions than the strict default.

At least, I tried.

It may be reasonable to make an interim release to check whether I
successfully fixed all the cases.

Ref issue: https://github.com/ooni/probe/issues/2154

.github/workflows/checks.yml

@@ -1,10 +1,11 @@
-# performs several code quality checks
+# Performs code quality checks
 name: checks
 on:
   pull_request:
   push:
     branches:
       - "master"
+
 jobs:
   perform_code_quality_checks:
     runs-on: "${{ matrix.os }}"