Fix handling of non-`string` values from repository properties API #7238

Job	Run time
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.19.4)	1m 30s
Go: tracing with autobuilder step (ubuntu-latest, linked)	1m 18s
Go: tracing with autobuilder step (macos-latest, stable-v2.22.4)	5m 7s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.18.4)	1m 47s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.21.4)	1m 18s
Go: tracing with autobuilder step (macos-latest, stable-v2.18.4)	5m 13s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.17.6)	1m 17s
Go: tracing with autobuilder step (macos-latest, stable-v2.19.4)	5m 24s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.20.7)	1m 26s
Go: tracing with autobuilder step (macos-latest, stable-v2.17.6)	5m 57s
Go: tracing with autobuilder step (macos-latest, default)	5m 58s
Go: tracing with autobuilder step (ubuntu-latest, stable-v2.22.4)	1m 13s
Go: tracing with autobuilder step (macos-latest, stable-v2.20.7)	4m 34s
Go: tracing with autobuilder step (macos-latest, linked)	5m 52s
Go: tracing with autobuilder step (macos-latest, stable-v2.21.4)	4m 23s
Go: tracing with autobuilder step (ubuntu-latest, nightly-latest)	1m 25s
Go: tracing with autobuilder step (macos-latest, nightly-latest)	5m 15s
Go: tracing with autobuilder step (ubuntu-latest, default)	1m 24s
	1h 0m 21s

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