chore: replace BouncyCastle BigIntegers and Arrays with JDK equivalents - #26793

 10 files  ±0   10 suites  ±0   10m 30s ⏱️ +17s
 31 tests ±0   30 ✅ ±0  1 💤 ±0  0 ❌ ±0 
144 runs  ±0  143 ✅ ±0  1 💤 ±0  0 ❌ ±0 

Results for commit eaadf51. ± Comparison against earlier commit 1fa96c7.