fix(deps): update module bitbucket.org/creachadair/shell to v0.0.8

This MR contains the following updates:

Package	Type	Update	Change
bitbucket.org/creachadair/shell	require	patch	v0.0.7 -> v0.0.8

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Release Notes

creachadair/shell (bitbucket.org/creachadair/shell)

v0.0.8

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