CI: fix arch name for arm64-lts #4006

Job	Run time
alpine 3.19.0 (musl)	10m 5s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 0s
coverage (ubuntu-20.04)	5m 15s
ubuntu-20.04 (package, non-mavsdk_server)	6m 57s
ubuntu-22.04 (package, non-mavsdk_server)	5m 59s
android-arm	5m 53s
linux-armv6	5m 21s
android-arm64	5m 52s
linux-armv6-musl	10m 19s
linux-armv7	5m 9s
linux-armv7l-musl	10m 20s
android-x86	5m 46s
ios	48m 21s
linux-arm64	5m 12s
linux-arm64-musl	11m 22s
android-x86_64	5m 56s
ios_simulator_x64	6m 49s
linux-arm64	5m 1s
ios_simulator_arm64	52m 13s
macOS x64	12m 50s
ubuntu-20.04 (mavsdk, hunter)	4m 36s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 41s
macOS arm64	6m 22s
ubuntu-22.04 (style and proto check)	1m 34s
macOS framework x64	13m 27s
ubuntu-20.04 (mavsdk_server, superbuild)	13m 10s
macOS framework arm64	7m 3s
Windows	12m 20s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 49s
iOS XCFramework	1m 19s
	5h 9m 1s

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