Update plugin spotless to v6.23.1 #1406

All 208 tests pass in 40s

208 tests ±0 208 ✔️ ±0 40s ⏱️ +2s
  82 suites ±0     0 💤 ±0
  82 files ±0     0 ❌ ±0

Results for commit 785835e. ± Comparison against earlier commit fec55f3.