bump version to 4.5.9 #1694

All 717 tests pass, 6 skipped in 1m 8s

167 files +  40 167 suites +40 1m 8s ⏱️ +6s
723 tests - 102 717 ✔️ - 107 6 💤 +5 0 ❌ ±0
729 runs -   97 723 ✔️ - 102 6 💤 +5 0 ❌ ±0

Results for commit ef245f2. ± Comparison against earlier commit 560c66d.