Increase maxRetries in CI conf

.github/workflows/run-tests.yml

@@ -128,6 +128,7 @@ jobs:
         run: |
           cp nitter.example.conf nitter.conf
           sed -i 's/enableDebug = false/enableDebug = true/g' nitter.conf
+          sed -i 's/maxRetries = 1/maxRetries = 3/g' nitter.conf
 
           # Run both Nimble tasks concurrently
           nim r tools/rendermd.nim &