build(deps): bump python-levenshtein from 0.25.1 to 0.26.0 in /lib/spack/docs #732

Job	Run time
changes	3s
prechecks / validate	37s
prechecks / bootstrap-dev-rhel8	4m 28s
prechecks / import-check	2m 40s
prechecks / style	58s
prechecks / audit / package-audits (windows-latest, powershell Invoke-Expression -Command "./share/spack/qa/windows_t...	5m 29s
prechecks / audit / package-audits (ubuntu-latest, bash)	8m 40s
prechecks / audit / package-audits (macos-latest, bash)	5m 19s
unit-tests	0s
bootstrap	0s
all-prechecks	1s
coverage	0s
all	0s
	28m 15s

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