ci: increase timeout for PR preprod tests workflow to 60 minutes

Extended the timeout from 30 to 60 minutes to prevent premature cancellation of the test-on-preprod job, which includes Docker service startup, API synchronization, and multiple test suite executions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: matiwinnetou

.github/workflows/pr-preprod-tests.yaml

@@ -15,7 +15,7 @@ permissions:
 jobs:
   test-on-preprod:
     runs-on: [self-hosted]
-    timeout-minutes: 30
+    timeout-minutes: 60
 
     steps:
       - uses: actions/checkout@v4