Fix handling of non-`string` values from repository properties API #7237

Job	Run time
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 27s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	5m 42s
Go: tracing with legacy workflow (macos-latest, linked)	5m 40s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 35s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	5m 58s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 11s
Go: tracing with legacy workflow (macos-latest, default)	5m 38s
Go: tracing with legacy workflow (macos-latest, stable-v2.22.4)	6m 54s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 19s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	5m 52s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 15s
Go: tracing with legacy workflow (macos-latest, stable-v2.21.4)	4m 29s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 29s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 22s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	5m 51s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 25s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 13s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	4m 56s
	1h 3m 16s

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