Add "horizontal" and "vertical" aliases for align_items and justify_content #7796

Job	Run time
Check towncrier / Towncrier Checks	23s
Pre-commit checks / Pre-commit Checks	38s
Package Toga (cocoa) / Create Python Package	17s
Package Toga (android) / Create Python Package	22s
Package Toga (core) / Create Python Package	14s
Package Toga (demo) / Create Python Package	14s
Package Toga (dummy) / Create Python Package	14s
Package Toga (gtk) / Create Python Package	21s
Package Toga (iOS) / Create Python Package	21s
Package Toga (textual) / Create Python Package	23s
Package Toga (toga) / Create Python Package	16s
Package Toga (web) / Create Python Package	14s
Package Toga (winforms) / Create Python Package	15s
MicroPython compatibility	35s
Test core (macos-latest, 3.9)	1m 6s
Test core (macos-latest, 3.10)	1m 7s
Test core (macos-latest, 3.11)	44s
Test core (macos-latest, 3.12)	51s
Test core (macos-latest, 3.13)	53s
Test core (ubuntu-latest, 3.9)	57s
Test core (ubuntu-latest, 3.10)	53s
Test core (ubuntu-latest, 3.11)	56s
Test core (ubuntu-latest, 3.12)	58s
Test core (ubuntu-latest, 3.13)	1m 2s
Test core (windows-latest, 3.9)	1m 38s
Test core (windows-latest, 3.10)	1m 36s
Test core (windows-latest, 3.11)	1m 38s
Test core (windows-latest, 3.12)	1m 37s
Test core (windows-latest, 3.13)	2m 41s
Coverage	24s
Testbed (macOS-x86_64)	7m 58s
Testbed (macOS-arm64)	6m 20s
Testbed (windows)	7m 28s
Testbed (linux-x11)	4m 50s
Testbed (linux-wayland)	5m 22s
Testbed (android)	10m 35s
Testbed (iOS)	7m 42s
Testbed (textual-linux)	42s
Testbed (textual-macOS)	1m 3s
Testbed (textual-windows)	1m 45s
	1h 17m 33s

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