Add alexrow to CODEOWNERS #1147

Job	Run time
coding_style_tests / Coding style	1m 17s
aarch64 cross-compilation	7m 29s
Security checks	9m 26s
linux_baseline (ON)	5m 19s
linux_baseline (OFF)	5m 12s
linux_intel (openssl-3.3.2, ON)	6m 59s
linux_baseline (-DOQS_KEM_ENCODERS=ON, ON)	5m 30s
linux_intel (openssl-3.3.2, OFF)	6m 52s
linux_baseline (-DOQS_KEM_ENCODERS=ON, OFF)	5m 36s
linux_intel (master, ON)	6m 46s
linux_intel (master, OFF)	6m 56s
	1h 7m 22s

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