Potential fix for code scanning alert no. 282: Workflow does not contain permissions

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Signed-off-by: Mustapha BARKI <code4yo@gmail.com>

Author: akabarki76

.github/workflows/codspeed.yml

@@ -1,4 +1,6 @@
 name: CodSpeed Benchmarks
+permissions:
+  contents: read
 
 # trigger on manual dispatch, pushes to canary, and daily schedule
 on: