Bump com.diffplug.spotless:spotless-plugin-gradle from 8.2.0 to 8.9.0 - #464

  183 files  +  137    183 suites  +137   4m 1s ⏱️ + 2m 58s
2 441 tests +  133  2 433 ✅ +  133   8 💤 ± 0  0 ❌ ±0 
9 638 runs  +7 330  9 592 ✅ +7 292  46 💤 +38  0 ❌ ±0 

Results for commit 9d02655. ± Comparison against earlier commit e5344b9.