Drop outdated `touch -d` example (#13631) #3

Job	Run time
plugins (windows-latest)	12m 2s
fmt-clippy (windows-latest)	5m 32s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	3m 54s
plugins (macos-13)	7m 47s
tests (windows-latest)	12m 47s
fmt-clippy (macos-13)	4m 53s
std-lib-and-python-virtualenv (macos-latest, py)	4m 1s
plugins (ubuntu-20.04)	5m 12s
tests (macos-latest)	4m 41s
fmt-clippy (ubuntu-20.04)	2m 39s
std-lib-and-python-virtualenv (windows-latest, py)	10m 11s
tests (ubuntu-20.04)	6m 22s
	1h 20m 1s

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