uptime: move to `feat_common_core` in `Cargo.toml` #6175

Job	Run time
Style/toml	7s
Style/lint (ubuntu-latest, feat_os_unix)	1m 7s
Style/format (ubuntu-latest, feat_os_unix)	21s
Style/lint (macos-latest, feat_os_macos)	55s
Style/spelling (ubuntu-latest, feat_os_unix)	56s
Style/lint (windows-latest, feat_os_windows)	2m 25s
	5m 51s

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