chore: bump fastify/github-action-merge-dependabot from 3.6.3 to 3.9.1 #3142

All 197 tests pass in 1m 41s

  10 files ±0   40 suites ±0 1m 41s ⏱️ - 7m 40s
197 tests ±0 197 ✔️ ±0 0 💤 ±0 0 ❌ ±0
208 runs ±0 208 ✔️ ±0 0 💤 ±0 0 ❌ ±0

Results for commit a9a3745. ± Comparison against earlier commit 95c2b80.