Update dependency argcomplete to v2.1.2

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
argcomplete (changelog)	==2.1.1 -> ==2.1.2

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Release Notes

kislyuk/argcomplete

v2.1.2

Compare Source

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• Test infrastructure improvements

• Indicate that there is no support commitment for fish and tcsh shells

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