Increase timeout for benchmark test to 1440 minutes (24 hours) (#498)

Hi everyone, as one of the requested changes from #493, this PR sets the
GitHub-side runtime limit for the container to 24 hours. This refers to
the GITHUB_TOKEN generated per job, which expires after that time
period. I've also tested longer runtimes and found that we should also
be safe to go up to 35 days if necessary. Further changes regarding
parallelization may follow once discussed.

Author: fabianliebig

.github/workflows/manual_benchmark.yml

@@ -38,6 +38,7 @@ jobs:
   benchmark-test:
     needs: add-runner
     runs-on: self-hosted
+    timeout-minutes: 1440
     env:
       BAYBE_BENCHMARKING_PERSISTENCE_PATH: ${{ secrets.TEST_RESULT_S3_BUCKET }}
     steps: