fix: Handle extra white-space in `MatchSpec` #1451

Job	Run time
Unix (macos-latest, debug) / Build binaries	50s
Unix (ubuntu-latest, debug) / Build binaries	31s
Unix (macos-latest, release) / Build binaries	57s
Unix (ubuntu-latest, release) / Build binaries	41s
Windows (windows-2019, release) / Build binaries	2m 22s
Unix (ubuntu-latest, debug) / mamba-content-trust tests	21s
Unix (ubuntu-latest, debug) / mamba integration tests	22m 57s
Unix (ubuntu-latest, debug) / libmamba tests	54s
Unix (ubuntu-latest, debug) / libmambapy tests	1m 21s
Unix (ubuntu-latest, release) / libmamba tests	44s
Unix (ubuntu-latest, release) / mamba-content-trust tests	19s
Unix (ubuntu-latest, release) / mamba integration tests	20m 2s
Unix (ubuntu-latest, release) / libmambapy tests	1m 26s
Unix (macos-latest, debug) / libmamba tests	2m 22s
Unix (macos-latest, debug) / libmambapy tests	2m 9s
Unix (macos-latest, debug) / mamba-content-trust tests	0s
Unix (macos-latest, debug) / mamba integration tests	15m 51s
Unix (macos-latest, release) / mamba integration tests	21m 13s
Unix (macos-latest, release) / libmambapy tests	2m 17s
Unix (macos-latest, release) / libmamba tests	2m 25s
Unix (macos-latest, release) / mamba-content-trust tests	0s
Windows (windows-2019, release) / mamba integration tests	53m 35s
Windows (windows-2019, release) / libmamba tests	2m 55s
Windows (windows-2019, release) / libmambapy tests	2m 45s
	2h 38m 57s

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