bump version to 4.5.9 #1694

All 827 tests pass, 3 skipped in 1m 25s

128 files +1 128 suites +1 1m 25s ⏱️ +23s
830 tests +5 827 ✔️ +3 3 💤 +2 0 ❌ ±0
831 runs +5 828 ✔️ +3 3 💤 +2 0 ❌ ±0

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